Print Gather ‘round the pop-culture campfire, boys and girls. It’s time for Uncle Edge and Cousin Exene and Grandpa Ringo to tell you a story about a crazy, beautiful time when future rock stars roamed the Earth in smelly vans, logging thousands of road miles for the privilege of playing live for you and a few dozen of your sweaty friends in a small, also-smelly nightclub near you. Remember live concerts? Dive bars? The joys of discovering amazing bands long before they became famous? Foo Fighters leader and massive rock geek Dave Grohl remembers, and with his new documentary, “What Drives Us,” he wants to make sure that you and your fellow rock ‘n’ roll friends never forget.