Wow, I never knew meetup.com charged - and it looks like as much as a streaming service. Wow. The only value I know of that meetup.com really provides is discoverability and rsvp. Neither of which seems that valuable for this.
It would be crazy to pay that monthly fee if you didn’t already. If it did have some value, I’d try and replace it with a free option. I think EventBrite is free for free events, and LinkedIn has a LinkedIn Event feature.