We held a ukulele festival on 27th February and it went very well. We had over 100 delegates throughout the seven hours and used Zoom and its breakout rooms facility for the workshops. Workshop materials were available via Dropbox but we also used screen sharing.

The festival used a website to detail the programme and directions. It's all at Ukes for Unicef

Of particular interest might be the pages on workshops which have links to the Dropbox folders: workshops and the technical help page

Hope that helps. Any specific questions that I can help with, please ask and I'll pop by and try and answer.