Click a name to see the location, or a map pin to see what's there. Either way, you'll see a pop-up balloon, and the Listings link there will take you to the venue's own official event page. You can learn even more about the club from there by browsing their web site.
Red pins (mixed-case names in the list) are the clubs. Blue pins (all-caps in the list) are larger reserved-seating stadiums and concert halls.