Sprint on Thursday announced a surprise press event that it will hold on August 19 in New York City. The invitation for the event says press can “take the edge off,” but we have a feeling this is more than just a happy hour. That said, we’re also not really quite sure what to expect from the event. Sprint has put a big focus on its Spark LTE roll-out, though there’s no indication this has anything to do with that. Likewise, Sprint has been beefing up its HD Voice network, but we’re not sure what “Edge” has to do with that either.