The workshop is free, even parking is free! It'll be hosted at USF, where Terence Parr, the creator of ANTLR is now a professor. Anyone with the interest is welcome to participate. Please send us an email letting us know you are coming.
The formal announcement page is here: http://www.cs.usfca.edu/ANTLR2004.shtml
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!