MONDAY >> Tom Kierein tells us that this is our last day of “comfortable humidity,” before that familiar wet hot D.C. summer returns. Seize the day and head to Fort Reno to take in Wooly Mammoth, Len Bias and Polynation. 7:15 p.m., free. TUESDAY >> Leave it to Canada to fuse punk and folk. The Weakerthans @ the 9:30 Club, with The New Amsterdams and Raising the Fawn. 7:30 p.m., $14. >> Three Stars alums…

If you’re like us, you’ve got more holiday parties to attend this weekend than you can count with your socks off. But just in case you’re still looking for more merriment, here’s a look at this weekend’s offerings. FRIDAY: >> Charm City’s own Lake Trout has been getting stellar reviews for their sophomore effort, Them, Not You. They also spent part of the fall opening up for the Pixies, which makes us so envious, we…