Hi Griffin,
Thanks so much for reaching out!
Unfortunately we don’t have a way to achieve this right out of the box.
If this functionality is a requirement for your intended project, I’d suggest that a third-party developer would be the best way to make this feature happen on a short timeline. ? We maintain a list of developers who work with our plugins on our Knowledgebase here:
https://theeventscalendar.com/knowledgebase/find-a-customizer/
You can also add or vote on this similar idea to our Feature Requests, as we tend to implement ideas based on customer feedback, so your input is greatly appreciated:
https://tribe.uservoice.com/forums/195723-feature-ideas/suggestions/10171929-force-minimum-number-of-tickets-purchased
Let me know if there’s anything else I can assist you with on this topic!
Thanks,
Jaime