I need answers to product questions for running an AA meeting

My AA meeting is purchasing a Zoom account. There are seven of us on the steering committee and we all need access to it. The meeting could have up to 100 people or 200 people January-March but usually trickles down to about 50. How could I make sure we have enough to seat the possibility of 100+ people and also make sure everyone has access without having to buy a workplace or extra licenses? I have not been able to get a clear answer. We cannot pay $50 a month nor can we purchase a business because of all the tax stuff (unless there is a way around it). Please advise! I have asked the bot, support agent (he basically hung up on me through the chat), and asked sales to contact me. No one has helped. Thanks!