There’s a nonprofit that wants to do several meetings for lectures for about 3000 students. The presenter will show screen or share a document for the most part. At the end students would raise hand and have some discussion, so they will be just viewers for most of meeting
Of course, big corps like teams and google meeting won’t Handel this much, not for free at least.
Could I suggest jitsi to them? Can it Handel this much? How much is it going to cost?


Not much free will handle 3000 people in a video chat. It takes quite a bit of bandwidth and/or processing power to receive, merge, and broadcast 3000 video streams at once.
Do all 3000 really need to participate via video in a conference style system? If not then, why not use a live streaming platform instead of a conferencing system? Many have text chat capabilities, just not video except from the streamer.