Is anyone else getting this when trying to dance, accepting dances, or visiting and purchasing from either of the Masquerade shops? I'm getting it constantly, and I wasn't earlier:
Yes, I just got that as well. Now I don't know who invited me to dance so I can't invite back.
Fatal error: Uncaught exception 'ElasticsearchCommonExceptionsTransportException' with message 'SSL certificate problem: certificate has expired' in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php:327 Stack trace: /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(319): ElasticsearchConnectionsAbstractConnection->throwCurlException(60, 'SSL certificate...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(206): ElasticsearchConnectionsGuzzleConnection->processCurlError(Object(GuzzleHttpExceptionCurlException)) /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(104): ElasticsearchConnectionsGuzzleConnection->sendRequest(Object(GuzzleHttpMessageEntityEnclosingRequest), '{"itemid":13263...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(166): Elasticsearc in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php on line 327
i've got the same issue as well; i hope this can be resolved soon, since i love the masq event!
edit: i'm still getting trinkets, but i've only gotten one lounge trinket for each of the two times ive been invited to dance by other users. i also can't see if the people i've invited to dance have accepted my invitation or not, and i dont know if i'm getting any trinkets for those dances i've invited people to (they haven't shown up in my inventory, and i've invited users more than once).

I'm getting it buying things from NPC shops and when I tried to redeem a subeautique invite. Seems it's everywhere.
Got it while purchasing a book for library quests.
Fatal error: Uncaught exception 'ElasticsearchCommonExceptionsTransportException' with message 'SSL certificate problem: certificate has expired' in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php:327 Stack trace: /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(319): ElasticsearchConnectionsAbstractConnection->throwCurlException(60, 'SSL certificate...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(206): ElasticsearchConnectionsGuzzleConnection->processCurlError(Object(GuzzleHttpExceptionCurlException)) /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(104): ElasticsearchConnectionsGuzzleConnection->sendRequest(Object(GuzzleHttpMessageEntityEnclosingRequest), '{"points":16000...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(166): Elasticsearc in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php on line 327
I get this constantly as well. After trying to turn in trinkets seems that they have disappeared after getting the error.
I have the issue as well, not only for dancing but also when trying to put a Pet into a new Training Session:
Fatal error: Uncaught exception 'ElasticsearchCommonExceptionsTransportException' with message 'SSL certificate problem: certificate has expired' in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php:327 Stack trace: /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(319): ElasticsearchConnectionsAbstractConnection->throwCurlException(60, 'SSL certificate...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(206): ElasticsearchConnectionsGuzzleConnection->processCurlError(Object(GuzzleHttpExceptionCurlException)) /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(104): ElasticsearchConnectionsGuzzleConnection->sendRequest(Object(GuzzleHttpMessageEntityEnclosingRequest), '{"points":360,"...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(166): Elasticsearc in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php on line 327
i'm getting it too :(
Fatal error: Uncaught exception 'ElasticsearchCommonExceptionsTransportException' with message 'SSL certificate problem: certificate has expired' in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php:327 Stack trace: /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(319): ElasticsearchConnectionsAbstractConnection->throwCurlException(60, 'SSL certificate...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(206): ElasticsearchConnectionsGuzzleConnection->processCurlError(Object(GuzzleHttpExceptionCurlException)) /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(104): ElasticsearchConnectionsGuzzleConnection->sendRequest(Object(GuzzleHttpMessageEntityEnclosingRequest), '{"itemid":13263...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(166): Elasticsearc in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php on line 327

Same~!
o/ o/ o/ Got this several times now ahah.
SPOILER (click to toggle)
Fatal error: Uncaught exception 'ElasticsearchCommonExceptionsTransportException' with message 'SSL certificate problem: certificate has expired' in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php:327 Stack trace: /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(319): ElasticsearchConnectionsAbstractConnection->throwCurlException(60, 'SSL certificate...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(206): ElasticsearchConnectionsGuzzleConnection->processCurlError(Object(GuzzleHttpExceptionCurlException)) /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(104): ElasticsearchConnectionsGuzzleConnection->sendRequest(Object(GuzzleHttpMessageEntityEnclosingRequest), '{"itemid":13263...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(166): Elasticsearc in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php on line 327
I got this error while trying to buy a sticker at the Menagerie, and while accepting a dance.
Edit: Just now got it again while accepting another dance.
Fatal error: Uncaught exception 'ElasticsearchCommonExceptionsTransportException' with message 'SSL certificate problem: certificate has expired' in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php:327 Stack trace: /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(319): ElasticsearchConnectionsAbstractConnection->throwCurlException(60, 'SSL certificate...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(206): ElasticsearchConnectionsGuzzleConnection->processCurlError(Object(GuzzleHttpExceptionCurlException)) /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/GuzzleConnection.php(104): ElasticsearchConnectionsGuzzleConnection->sendRequest(Object(GuzzleHttpMessageEntityEnclosingRequest), '{"itemid":13263...') /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(166): Elasticsearc in /www/subeta.net/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/AbstractConnection.php on line 327
Like a good neighbor, stay over there!

Now it's doing it when questing, but it's still taking the item. Just lost 2 books to the library at 46k apiece.
I just got it twice when trying to activate my GA, about to make a post when I saw yours.
Just got that on accepting a dance that looks to be from (guessing, based on her outfit)

I'm also getting those errors when I try to buy from shops or train my pets :(
Just tried putting my pets in training and received the same error...
Having this trouble when trying to quickstock
got the error when buying from the meangerie. just lost the tokens.
I am having the same problem! Not just for the event, it's everywhere including quests and all shops. Shop purchases do go through and the item appears in my inventory, except when I try to turn it in for a quest, the quest doesn't end and I can't start a new one. However, it kept giving me rewards (but not the bracelet piece I need for Shinwa's quest) every time I tried to see if the error would happen again, which it does.