Please check out the individual clubs' websites for venue details and start time 

IMPORTANT NOTICE ABOUT OPEN HEATS

An open heat is one in which the host club agrees to allow visitors to the club to qualify for the final.  If you wish to play in an open heat you should first make yourself known to the heat’s club contact at least 4 days before the heat as you may need to be added to the list of players authorised to play in the club’s online games. Some clubs will require you to be sponsored by a club member before adding you to their admissions list.  You should not expect to play in an online heat as a visitor simply by turning up to the heat unannounced.