I was just wondering if there will be a future event where we can continue to make those flower bouquets, like from esthers wedding. I have been holding onto my extra flowers just in case. Was that a one-time event or something? Anyone have any ideas?

It was promised at their wedding that there would be a future event. In particular this year this bouquet-making was repeated for their first anniversary.. They were the same bouquets as you could have made at their wedding. They may or may not do this again next year, and they implied two years ago that there might be other kinds of bouquet-making events. We haven't seen any other kind yet.

Right now flowers are cheap compared to their only-on-hoiday-bestowal-worth of Vesnali Coins. It's worth you while to buy some just-because, IMO.

My own idea then, is if you like items from Esther's it's worth your while anyways to buy a few of each flower and not just the kinds known to make bouquets so far. Store them in your Vault. If it turns out that no further boquets are possible or no new kinds of bouquets are possible, then next spring whip them out and bestow them for Coin as part of the next Vesnali.