Hi Zee,
Thanks for reaching out! This is not currently a setting that is available in our free or paid versions, but limiting RSVPs could be done with a customization. If you’d like to give it a shot, I’d recommend taking a look at this thread, which has some info on limiting RSVPs (note that this solution will limit RSVPs in general, but additional work would be required to do it on a per-user basis) along with our themer’s guide, which has some great information on customizing our plugins.
Does that answer your question? Please let me know if there’s anything else I can help with!
Thanks,
Jennifer