I attended a 3-day online conference with 300 people - tools organisers used:

This week I attended a conference that had to change plan -- like 100s of other conferences - and move online.

There was about 300 attendees. The event went very well.

Below is a list of tools they used:

- Mailing list: to engage the conversation with registered attendees before the start of the conference.

- Typeform: to collect information before the start of the conference.

- Loom: to communicate voice + shared screen messages with attendees

- Zoom: to host keynotes, panels (and stage managers); audience could Q&A, chat and "raise hands"for each "room."

- Mighty Network (white label social network): for attendees to create profiles, chat with each others via direct messages and group messages; plus a newsfeed.

- The organisers had built their own platform for attendees to browse the program (keynote, panels and workshops) and link those to each dedicated Zoom conference room. That worked fantastically.