This originated from a slip of the tongue by actor Nathan Fillion during an interview, when talking about Firefly fans.
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Can't Stop the Serenity is a global charitable event to benefit Equality Now and other causes (chosen at the local level, some cities include Kids Need to Read, a charity co-founded by Firefly/Serenity star Nathan Fillion and author PJ Haarsma).
Additional attendees are vendors, selling a variety of merchandise, and fan groups such as the 501st Legion (Stormtroopers), Klingon Assault Group, Star Fleet, The Browncoats, Stargate:SO-Com, Shadowmoor, and The Buccaneers of the Atlantic Coast.