I just got a second email about an event at Earls Court. Same deal except this bit at the end...

Expect to queue to leave the venue: Volleyball is not a timed sport, so sessions may finish later than scheduled. Make sure you leave plenty of time to exit the venue and make your onward journey – especially if you’re going to another event afterwards – and think about using an alternative station such as West Kensington, Barons Court or Gloucester Road. It’s especially important to plan your onward travel if you have a ticket for a late session – night buses run from Hammersmith station, around a 20-minute walk away.