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2.
A social gathering that involves many females. There are only a few males present at a clam fest, thus making them more appealing to the abundance of females.
oh man! erik, you totally should have come to that party last night! it was a clam fest!
by Ryan June 18, 2004
 
1.
The antithesis of a sausagefest. A social engagement catagorized by high levels of estrogen.
Man, lets ditch this clamfest. If I wanted to hear people talk about the The O.C. I'd hang out with my little sister.
by Eric Greif October 05, 2005