Bias alert: Years ago, the editor of this esteemed publication played in a rock ’n’ roll band with David Oakley, the guitarist for the Orlando indie pop outfit Empire Theory, which is playing at One Spark’s opening ceremony. (Said editor would like to remind said guitar player that he still has his 1998 American Fender Stratocaster, which he misses terribly.) All that aside, the band is really quite good, and since you’re going to the One Spark opening ceremony anyway – of course you are – you’re going to check them out, and you’re going to like them, and you’ll discover that they’re awesome guys, and then you’ll tell your friends you heard about them here first. They’ll be playing half-hour sets before and after the ceremony, as well as providing backing-band duties during. (Then they’ll be meeting up with our editor to return his damn guitar. Right, fellas?) 6 p.m. April 9 at Hemming Plaza, Downtown, free.