This time slot has been already booked error

Why do I have to book into a time slot? book time slot
➡️【Mk.com】✅is a brand new online gambling platform✅, providing players with rich casino games and attractive promotions. ✅  To help keep you safe & ensure you have an enjoyable visit, we're limiting the number of visitors therefore you will need to pre-book your entry in advance book of sand slot The time you book is your time of arrival; you need to arrive during your selected time slot We have time slots so that we can stagger

book of skulls reloaded slot I believe can help you; you create 1 event per shift and the volunteers would book the shift they want; you may need this feature togled