I'm still eager to know of festivals/workshops for other instruments, but if you're interested in creating one this might help. The Story Crossroads blog from Aug. 17, 2020 to Aug. 25 presents a five-part series on "How to Set Up Virtual Events." In blog format, since the most recent appears first, it's best to go all the way back to the first part, working through what you need up to the end. It's written for storytelling events, but is intended to fit other performing arts and virtual events.
Hope it helps replace some events. It gives an interesting choice of times if you want to go global.
My only regret is my other type of event is theater and "You know what you call recorded plays . . . movies."