Hi, Alex. Thanks for getting in touch with us about this.
It sounds like what you’re looking for is some way for your volunteers to RSVP to your events. Unfortunately, at this time, we do not have an RSVP solution built-in to Events Calendar PRO.
In this situation, many of our users set up free tickets using the WooCommerce Tickets plugin and then have their volunteers claim them. We understand that that’s not ideal, but do you think that would do the trick for you?
Let us know if you have any further questions before you buy the add-on. If you have already purchased it, please feel free to post in our premium support forums for a faster response time.