1) Happy President's Day
See what's open and closed in Somerville today.
2) DIY 101: Alterations & Mending Workshop
Learn how to repair your clothes by hand. The class is at Boston Vintage Factory at 6 p.m.
There's some at Bull McCabe's at 8 p.m. and at Johnny D's Uptown Restaurant & Music Club at 8:30 p.m.
4) More trivia
In Harvard Square, John Harvard's has some trivia, too. It's at 33 Dunster St., Cambridge, at 9 p.m.
Sunny and breezy with a high around 31.