The Venues page lists all of the venues that have been added to your league.
A Venue is the establishment, casino, bar, restaurant, etc., where your tournament takes place. When you enter a Tournament all of your Venues will be available to select from a drop down menu, so you will only have to enter Venue information once.
The Atlanta Poker Club plays at different sports bars and restaurants around Georgia. They name their venues as follows: the running number of when the Venue was created (001) + name of the establishment (Jeffrey's) + the day of the week the Venue plays (Tuesdays). 001 Jeffrey's Tuesdays.