Yes, an MCPS charge dependent on sales as returned by the publisher annually.
This may be split between publisher and artist (if different) according to the terms of contract.

A venue nowadays usually/always (Ruth?) pays for a blanket annual PRS licence as in broadcasting and no longer completes PRS returns. So going round all your participants asking them exactly what they're going to do at your event no longer applies. It is the venue that is licensed, not the individual concert/session.