It's a run within Bloomsday, and hundreds of people are already racing just to get into it.
Corporate Cup, which opened its registration last week, is filling up with companies fielding teams. As of Thursday, 208 teams had signed up. The cup accepts the first 250 teams that register.
"People are pretty much following directions, thank goodness," said Mark Starr, Corporate Cup committee chairman. "A couple of people jumped the gun and sent stuff in without the proper registration forms. They didn't send the right amount of money, they sent it to the wrong P.O. box."