Hi SINically!
I don't know of any conventions, except the Coney Is. one, that I believe just finished. Most conventions are in the south, there is one in Tampa, FL called MerPalooza in August. I don't know if the Las Vegas event is happening this year or not.
I'm just getting back to swimming after a year hiatus, and moving to a new home. Took a while to find a new pool (it's in NH, closer to drive than my former gym in Westford) I absolutely love my new fitness center (has 3 pools) and they let me swim with fins in any of them! Perfect for mermaid exercises!
(((HUGz))) and Bubble
https://mail.google.com/mail/u/0/e/B0C'z
Mermaid Marla