Neither am I, and I founded the thing.
HERC's quarterly events mostly look to emulate the seasonal "Special Events" that the devs and players used to hold in the game. Our Anniversary Event was costume contests and music. The Summer Block Party, we had a Player Mission (Find kidnapped catgirls = Hide and seek). For Halloween, we have some ideas we're working on.
You don't need to RP to participate: most attendees are just playing themselves or talking freely among each other. Nothing wrong with Role Play, of course, but it's hard to make large RP events that are open to the public (well, the "uninitiated" anyway).