Urban Assault Ride

New Belgium Brewery's Urban Assault Ride bike obstacle race arrives in Chicago today, starting and ending at Murphy's Bleachers, 3655 N. Sheffield Ave. The race begins at 9am. Registration is $120 per two-person team; registration closes at 4pm Friday, Aug. 17. It's free to watch. Proceeds benefit Break the Gridlock.

Chicago Air & Water Show

The Chicago Air & Water Show runs Saturday and today on the lake and in the air (of course), with the action centered on North Avenue Beach. The show runs from 10am to 3pm both days; see the schedule for specific programming. Free.

Chicago Korean Festival

The Chicago Korean Festival runs today and Sunday on Bryn Mawr Avenue between Kedzie and Kimball. The festival features a variety of traditional and contemporary Korean sports, singing competitions, musical acts and more. The action begins at noon today; see the program for event times.

Empty Bottle Garage Sale

The Empty Bottle, 1035 N. Western Ave., holds a garage sale today at noon. Free, 21+ unless accompanied by a parent.

Glenwood Avenue Arts Festival

The Glenwood Avenue Arts Festival runs Aug. 17-19 on Morse Avenue and Glenwood Avenue, with music, theater, art and food from around Rogers Park and the city. The festival runs from noon to 9pm today. Free; donations accepted.

Morse Ave. Main Stage:
noon - Hannah Frank
1pm - Dylan Andrews Trio
2pm - The Chris Green Quartet
3pm - Jonas Friddle & The Majority
4pm - Roostersocks
5pm - Nicholas Barron Band
6pm - The Shadows of Knight
7:30pm - Urban Rhythm

Glenwood North Stage:
noon - In One Ear presents Peter Wolf and Friends
1pm - School of Rock Lakeview
2pm - Miki Croisant
3pm - Theo Ubique Presents
4pm - Kmang Kmang
5pm - The Lauren Wolf Band
6pm - Furious Frank
7:30pm - The Henhouse Prowlers

Glenwood South Stage:
noon - Tambours Sans Frontieres
2pm - Flurbyhoops
2:30pm - Lifeline Theatre kids series
3pm - Northside Dance Theatre
4pm - The Eddie Stevens 3
5pm - DJ Marc Moose Moder
7pm - Straight Ethyl

A 10pm aftershow at Morseland, 1218 W. Morse Ave., features Good Music Sunday with Shawn T.

Kangols & Eight Ball Jackets - Old School Hip Hop Block Party @ Union Park

Union Park, 1501 W. Randolph St., hosts "Kangols & Eight Ball Jackets - Old School Hip Hop Block Party," today at 2pm. Hosted by MTV's Sway and VH1's Janell Snowden, the concert, part of NBA star and Chicago-area native Shannon Brown's Wood-Star Music Festival, will feature performances by legendary hip hop artists including Rakim, MC Lyte, Doug E. Fresh & Slick Rick and more. Tickets are $55; for more information, call 312-361-0232.

Grilling Series @ Publican Quality Meats

Join the chefs at Publican Quality Meats, 825 W. Fulton Market, today from 3pm to 8pm for a parking lot barbecue. They'll provide the meats (natch), sides, dessert and cocktails--and even seafood and veg alternatives. Chef Jason Hammel of Lula & Nightwood will join PQM at the grill.

Nerds at Heart

Geek dating service Nerds at Heart meets at O'Shaughnessy's, 4557 N. Ravenswood Ave., from 4pm to 7pm (check-in begins at 3:30pm). Play games, win prizes and giveaways, and meet some new people. Admission is $30; online registration is required. 21+