DELRIDGE PLAYGROUND-BUILDING DAY: As previewed here last night. It’s been less than four months since first word that a new playground at Delridge Community Center could happen largely thanks to donated materials, time and labor, and today’s the day, with hundreds of volunteers on site.

“SAFETY CITATIONS”: 10-11 am, firefighters from Engine 29 will be on Alki looking for kids wearing their helmets properly – and they’ll get “safety citations” good for free Subway sandwiches!

HIAWATHA FUN FEST: Noon-3 today at Hiawatha Community Center – games, activities, prizes.

WEST SEATTLE HI-YU JUNIOR COURT CORONATION: During the Fun Fest, starting around 12:45 pm, the new Hi-Yu Junior Court will be announced and coronated (look for the stage on the east lawn @ Hiawatha).

FREE GUIDED ECO-HIKE: Once a month, the West Seattle-based Nature Consortium< offers a free guided hike through the West Duwamish Greenbelt, where it works on forest restoration, and today’s the day – 1 pm, meet at trailhead at 14th SW/SW Holly (here’s a map; RSVP if you can to lisa@naturec.org).