This is your chance to see the hottest OPM acts of today, including Bamboo, KZ Tandingan, Moira Dela Torre, Shanti Dope, Gloc 9, Ben & Ben, and Hashtags at the SM Mall Of Asia Arena in Pasay City on September 20. The big OPM concert is brought to us by freenet entitled Freeniversaya: A FREEnet…