Sirius XM radio hosts Gregg “Opie” Hughes and Anthony Cumia marked their 20 years in radio together with a live broadcast of the sat caster’s “Unmasked” show, hosted by Ron Bennington, from the Carolines Showroom on April 17.    The duo, along with their co-host, comedian Jim Norton, shared stories from their illustrious — and often turbulent — career with more than 250 of their hardcore fans, who were treated to a meet-and-greet after the event and a commemorative poster signed by Opie, Anthony and Norton.