A system of unseasonably cool air is expected to roll in today, but the various summer festivals will be every bit as fun while you are wearing jackets and long pants. Here come the highlights from the PDD Calendar.

The week starts as every week should — with a hardcore heavy metal concert at a Christian indoor skate park. Colossus, Conveyer, Strengthen What Remains, Lessons and Heart’s Bane all perform at the Encounter on Monday. You can choose instead to hang out in a wood shop and make beds for the needy, so there are at least two places to wear a sleeveless shirt this week.

Tuesday night the Chester Creek Concert Series continues with a performance by the Formal Age. Later in the evening, at Tycoons Alehouse, the Adam Booker Group will be playing jazz versions of Trampled by Turtles songs. Why? For fun, that’s why. But also because the hometown heroes are releasing a new album and appearing on The Late Show with David Letterman again.

Wednesday is the 47th annual chance to tour and covet nice homes and gardens. Also, Dedric Clark and the Social Animals are releasing a new album at the Red Herring Lounge.

Thursday is day two of Hermantown’s Summerfest, featuring a performance by the Fractals at the Fichtner Soccer Field. Bring your own lawnchairs. Or, take in some theater instead. The Duluth Playhouse is staging Les Misérables at Symphony Hall, and a ragtag troupe of medieval players will perform Pippin at the Harbor City International School Theater.

Friday is a night of new and old local rock stars. Up-and-comers Vivielle, hot off the release of the single “The Start and the End,” perform at Fitger’s Brewhouse. On the west side of town, a group of 1984 Denfeld and Hermantown grads reunite their band, White Hydra, for a night of classic rock at Spirit Mountain’s Riverside Bar and Grill.

Saturday is the ninth annual Bayfront Reggae and World Music Festival. Kevin Lyttle and Morgan Heritage are the headliners. If you are not into outdoor celebrations of love, respect, anti-materialism and legalizing cannabis, perhaps you’ll prefer an indoor experiment featuring a wide range of drone, ambient, improv, electro, outsider and left-field sounds — such as the Zeitgeist Experiments at Teatro Zuccone.

Update: The Sunday performance at Bridgeman’s in Gary-New Duluth featuring Todd Eckart has been cancelled. (See note in the comments.)

Our beloved PDD Calendar Editor Lawrence Lee is off this week, but the junior varsity calendar team won’t let you down. If we’re missing an event, let us know.