Day event feature

We are holding a marathon charity football match in aid of Cash For Kids on the 10th June and I am looking for a plugin/software that will let anyone who wants to take part chose a 1 hour time slot they would like to play in, its running from 8am to 8pm

Bookingpress looks like its near enough, just would be amazing to limit the appointments to a single day (10th June) and eliminate the service & date to just chose a time slot

I hope this makes sense and your software is amazing as it is, will definately use if I need a booking software for a client.

The website for the event is still in progress here https://www.12hoursof5s.co.uk/