I'll try to be around running games today starting from now until around 8:00pm (GMT). If you pop in and I don't start the game immediately, wait a bit as I don't get any notifications if someone joins in the lobby. I'll make sure to check in on the hour to so that would be the best time to jump in.
Also, If you don't see any games in the main menu, wait a few minutes. The menu currently doesn't show any active / ongoing games so it might look nobody is playing even though there might be a game running currently. One match usually lasts just a few minutes max so the waiting time shouldn't be long. :)