Let the party begin.
One of the first stops on this year's annual Pub Crawl, Callahan's Bar on Main Street.
"You start early, you'll probably pass out early, but you keep going and you have a good time," says B.U. Senior Dan Cherico.
"We're looking to have a great time for our senior year, it's our last hoorah," says B.U. Senior Dara Herschenfeld.
This year, a lot of people hope these students celebrate, under control.
City Council called for open container laws to be enforced.
Bars are beefing up security, and police are keeping a watch.
Bar owner Rick Callahan says the students never give him a problem.
"The police don't want them outside with any open containers, just ask them not to leave and they don't, they're fine about it," says Callahan.
All the seniors we talked with are aware of the controversy, but they don't seem to mind.
"We're seniors, we earned it, 4 years of hard work. I mean I'm going to med school, I'm not going to be able to do this in med school. Let me have my fun," says one student.
"We're very excited, and our cups our empty, and we're only drinking inside the bars," says B.U. Senior Amanda McCaslin.
But for some students, the day isn't all about alcohol.
A group from BU organized this alcohol-free Bearcats Day, for students and community members.
And a lot of students in the bar crawl can pass through the Bearcat event, enjoying the food, entertainment, but no alcohol.
"They're stopping in, they're eating, getting some food in, drinking water, and they're continuing on," says Bearcat Day Coordinator Jason Bronowitz.
Another way to help make it a safe celebration for everyone.
B-U students say they'll pub crawl through the night.
But the alcohol-free event ends at 9pm.
Court Street between Water and State is closed to traffic until then.