Can we extend the number of attendees (500) for 1 meeting?

Hi @vinhan151 

I believe you would need to purchase the 500 Participant Large Meeting Add on for $50/month - and then cancel before it renews.

You may want to also consider using Webinar for an event of that size. The cost would be higher, but the functions of Webinar might be useful for such large numbers.

Rupert