Does anyone know an open conferencing solution that allows smaller
workgroups within a larger unit?
BBB has breakout rooms. I haven't experimented with them, but it looks like you can set them up so that people can join the one they want, be randomly assigned, or be manually assigned to one. https://support.blindsidenetworks.com/hc/en-us/articles/360024516512-Create-and-manage-breakout-rooms describes features and limitations. Might be something to play with on bbb.emacsverse.org? Maybe we'll give it a try at EmacsConf too, like having a general hangout during lunch break. Might be fun!