Changing this to an ongoing topic, as we might need one if BotCon no longer exists.

TFCon in Canada this year (Toronto, July 15-17), has two Gen1 VA guests noted - Frank Welker and Dan Gilverzan (Bumblebee)... plus Ian James Corlett (Cheetor).
That's as impressive as some BotCons, and will be a worthy replacement for many fans.