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3.
A crazy gathering of the nerdiest people you can imagine, usually taking place in the basement of one of the aforementioned nerds. Crazy things will go down when these nerds get together, with the violence and insanity of cesium exploding inside the toilet of a well-known celebrity.
Jerry: That nerdfest last night was insane!

Bob: Yeah! When we play Trivial Pursuit, we play it HARD!
by birdman-vladimir November 26, 2010
 
1.
any event or gathering of nerds during which the enjoyment of a nerdy subject is experienced.
the lord of the rings philosophy lecture at my college was a nerdfest: it attracted nerds and the subject matter was extremely nerdy.
by veryhappychica January 04, 2005
 
2.
A gathering of humans with above average IQs who enjoy activities associated with nerds. At these gatherings there is talk, dance, food, song, games, video and other forms of entertainment. There is minimal to no alcohol/drugs, with the only 'highs' coming from laughter and caffeine. Participants are nerdfesters, nerdfestivites, or some other such name.
Person1: We had a nerdfest down in my basement from five to eleven.
Person 2: Wow, I wish I had been there.

Person 1: Are you going to the nerdfest tonight?
Person 2: I have work so I will be there late.
by Nibs95 November 26, 2010
 
4.
any event/function/conference that attracts crowds of nerds or inspires lots of nerds to attend it's functions. things that appeal to nerds and causes them to gather in great numbers, such as: a sci-fi/fantasy movie premiere(e.g. "star wars", "transformers", "harry potter") or a conference based on popular nerd fare such as: "star trek" conference, or "comic-con", "macworld"(or any computer confab)"anime festival"(cosplay), etc. any event which causes large numbers of nerds to leave their parents' basements and their computers and go out in public in large numbers
person1: "man, i went to an early matinee of transformers, hoping to avoid the nerd fest, but no such luck."
prson2: "yeah, i went to the macworld conference last year; what a huge nerd fest!"
by lober July 11, 2009