Summer festival season is in full swing and the weather’s perfect for outdoor music, food and fun in and around Seattle this weekend.

Ballard SeafoodFest is celebrating its 40th summer party with entertainment, food trucks, arts and craft vendors and salmon barbecue Saturday and Sunday.

There’s music all day on the MainStage, storytellers, music, clowns and puppet shows at the FamilyStage and contests and Nordic music at the SkolStage hosted by Leif Erikson Lodge and the Nordic Heritage Museum.

Kids can hop on the big purple slide and play at Kids Zone at Ballard Commons Park and dress up as their favorite classic or made-up alter-ego for the Kids Super Hero Costume Contest with divisions for teens, ages 12 and under and ages 7 and under at 3 p.m. Sunday, register at 2 p.m., at SkolStage.

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Ballard Festi-Bowl offers skateboarding instruction for all ages and levels, exhibitions and competitions, 3 to 9 p.m. Saturday in the Ballard Commons Bowl. Ballard BeerFest, introduced at SeafoodFest last year, has an expanded beer selection and a new location closer to the MainStage this year, and a Sunset Satellite Beer Garden includes festival after-parties Saturday and Sunday on Ballard Avenue.

Other festivals this weekend include West Seattle Summer Street Fest with vendors, beer garden, music, kids’ activities, food and pet activities Friday to Sunday in the West Seattle Junction, and one of Seafair’s signature events, the Milk Carton Derby, Saturday at Green Lake. The popular Chinatown-ID Dragon Fest features lion and dragon dances, martial arts demonstrations, taiko drumming, Anime Costume Costume Contest and $2 food walk at local restaurants Saturday and Sunday. For a complete list of festivals and other activities, see today’s Datebook.

Madeline Mckenzie: mmckenzie@seattletimes.com