Here's how I think it went down and why the movies was an excuse.
1) They were up to no good and probably in an altered state of mind
2) The decided in that altered state of mind, that they could be a few minutes late (lol)
3) The team started calling their cell phones about 5 minutes after the meeting started
4) They were too f'cked up to answer so they came up with the movie excuse as to the reason they didn't
answer their cell phones. "We had to shut them off in the theater" (yea, I know they could set them to vibrate but they're idiots).