A few minutes ago, I just got

Ikaro has accepted your proposal to dance! As a token of appreciation, they have given you 2 Steamworks Trinkets!

O.O But the Masquerade is over? I have the Steamworks Trinkets in my inventory too.

I think people can accept the requests they have gotten long ago still, but people can't send the new requests.

If the event did not clear, then people can, technically, still accept dances. That's from the programming stand point. I am not too sure how the user administration department handles this, so it might be best to file a ticket.