Corrected entry: Near the beginning of the film, Castor is at the LA Convention Center setting the bomb. After the scene with the choir singing, there is a shot of the outside marquee that shows a choir convention running from the 18th - 21st. He then tells his boys to stay away from LA on the 18th because it's going to be a bit smoggy (the bomb). Later as Archer, after defusing the bomb, he is told that the targets for the bomb were some judges at a convention or something like that. The dates just don't add up - it was already the 18th when he initially set the bomb.
Packergirl
7th Nov 2004
Correction: The choir was only a rehearsal, no audience was there, only a few people, who probably work there. So there are still plenty of days to pass till the 18th. No plot hole there.
Ronnie Bischof