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this is how the @MondaireJones team successfully hosted large (50+ vols) virtual phonebank events every day on zoom. all credit goes to @VotrubaLaura, Elyse, and our incredible college fellows for developing this system:
first we created an ongoing permanent zoom link for our events and shortened it using http://bit.ly to minimize confusion & make it easy to recruit friends. we had daily links ( http://bit.ly/MondaireMondays ) but in the future i would just make one overall
we had a VAN events page ( http://bit.ly/mondaire-events ) & when people signed up to phonebank, their auto-confirm email (also set up through VAN tho the process is annoying) included the http://bit.ly zoom link to prepare people emotionally for the process of logging in 
on the day of the phonebank we sent an email including: info about the browser they'd need to use our dialer, a link to the script, a link to a one-pager abt @MondaireJones ( http://bit.ly/mondaire-1-pager), & the zoom link. we asked folks to reply to the email to minimize our spam rate.
on our confirm calls we'd remind ppl about browser/tech requirements for the dialer AND sign them up for our call-team slack channel where we'd answer questions, give ppl updates on call numbers, and share inspiring stories/advice during phonebanks!
the great community in our slack channel (managed by our amazing college fellows like @AnnaHorowitz @sofiiaaagg @mwfisch etc etc etc, pls hire them) kept ppl coming back for more phonebanking, despite the weirdness of making calls at home alone!
we had 5 phonebank roles: zoom admin/host, flake chasers (2), breakout room (2+), and our training leader. they'd login a few mins before the phonebank to prepare + make sure they knew who was who! they were all made co-hosts, & only hosts could screenshare/have un-muting power.
NO ATTENDEE WAS ALLOWED TO UN-MUTE THEMSELVES. they had to use the chat. sometimes they came up with funny ways of getting our attention... like holding up signs... #NoRegrets though honestly i'll stand by no un-muting powers on calls with more than 10 ppl as long as i live 
zoom admin pre-opened lots of breakout rooms, then managed muting, security, + questions in chat. they copy/pasted all relevant links into the zoom chat (dialer, 1-pager, slack, script) every 2 mins so new joiners could see them! << very important.
at the start, we'd ask returning phonebankers to put a * in front of their name on zoom (moving them to the top of the breakout room list) so they could be put in a breakout room with other old-timers and start calling immediately, bc they didn't need a training!
Elyse told us "confusion is a disease" + we have to stop it from spreading. whenever anyone had tech issues, the zoom host would IMMEDIATELY stick them in a breakout room w/ a breakout leader to troubleshoot! we didn't allow any 1:1 convos/confusion to be aired in the main room.
our flake chasers would screenshot zoom attendees and look at our attendance sheet, then call/text late arrivals and flakes to make sure they showed up. if they came late, they'd get put in a breakout room for a quick separate training so they didn't get confused/lose interest.
our breakout leaders were great at asking folks to screenshare + troubleshooting issues, but were also quick to push ppl to a VPB instead of a dialer when they weren't as tech-savvy. no use in wasting time or dropping calls if someone wasn't going to get the hang of thrutalk.
once calling started, zoom host monitored thrutalk & posted screenshots: # of calls, # of active callers, etc to keep ppl motivated. our vols posted stories of good & bad calls and kept the energy going to make sure ppl felt like part of a "virtual campaign office"
we'd set call goals for the night & make sure vols knew our goals, then kept them updated on progress. this helped keep ppl calling for several hours & sometimes convinced other vols on slack to jump in to help out. we celebrated breaking records whenever possible!
we used thrutalk's nightly reports to maintain a dashboard of call time leaders (ppl who had spent the most minutes calling that week) & gave them shoutouts on slack... this definitely awakened ppl's competitive spirit :o
at the end of the phonebank we'd gather ppl on zoom for a debrief, and try to re-shift them! we haven't perfected our re-shifting strategy (especially on huge calls)... would love to hear how other campaigns solve this!
this is one way we made large virtual phonebanks work. if you're currently organizing, pls share your best practices + tips + tricks!!! shoutout to @sunrisemvmt which does a great job @ events like these as well!
