Literally everywhere will be a good place to go, especially if they even have a passing resemblance of being an Irish pub. Double that for any sports bar type place since it's also March madness. Triple it because public school teachers have a half day.

Some places will have tents with live bands set up as well into the night if that's the vibe you're going for but they will charge a cover/entrance fee for the privilege. In Canton, El Buffalo and Claddaghs usually has a tent set up. Delia Foley's in Fed Hill/Sobo will as well.

Fells will be crowded as well for all the reasons I mentioned in the first paragraph, especially Slainte and Max's.