How many attendees can the software host?

The software itself does not host any live streaming presentations nor meetings. You will need to use a different platform such as Zoom or Facebook live for this task, so you can have as many as said platform can host. 
The Virtual Summits Software can have up to +10,000 Registrations in the Business Premiere plan. We’ll never limit attendees from registering for a summit. If you go over your summit limit you’ll simply pay a small fee for additional registrations. You can increase that number by purchasing more credits. These registrations are per summit. So if you host more than one summit, each new summit gets a new set of registrations to start with.