Today

South Lake Union Block Party

Outdoor entertainment for all ages, food from local restaurants, beer/wine garden, arts and crafts, 11 a.m.-4 p.m., on the lawn and parking lot behind South Lake Union Discovery Center, Westlake Avenue and Denny Way, Seattle; free (206-342-5900).

Jammin' Against the Darkness and Jamfest

Slam-dunk competition, 3-on-3 basketball tournament, local bands, skate and bike demos and children's area, 8 a.m.-5 p.m., outside KeyArena, free; Christian rock groups, Sonics' Luke Ridnour and other NBA stars, UW basketball coach Lorenzo Romar, champion bikers and skateboarders and an inspirational message, 7 p.m., KeyArena, Seattle; $11 (425-427-2182 or 206-628-0888).

Fiestas Patrias, South Park

Parade, vendors, children's activities, music, interactive dancing, traditional Latin American food and Bi-national Health Week education activities, 11 a.m.-7 p.m., South Park Community Center, 8319 Eighth Ave. S., Seattle (206-684-7451).

Explore Woodland Park

National Orienteering Day newcomer event, activities for children and families to explore the park for checkpoints marked on a map, start 10 a.m.-noon, Woodland Park, 700 N. 50th St., Seattle; $3-$10 (206-399-6742 or www.cascadeoc.org).

Light the Night Walk

Leukemia & Lymphoma Society's nationwide event, walkers carry illuminated balloons to celebrate and commemorate lives touched by cancer, registration 6 p.m., walk 7 p.m. Saturday, Green Lake Park, 7201 E. Green Lake Drive N., Seattle; donations requested (888-345-4572 or www.lightthenight.org/wa).

Museum birthday party

Birthday cake and party room for kids, 10 a.m.-5 p.m., Rosalie Whyel Museum of Doll Art, 1116 108th Ave. N.E., Bellevue; $5-$7 (425-455-1116).

Troop to Trek

Military family appreciation day with crafts for children to send deployed parents or to send to other personnel serving overseas, 9:30 a.m.-5 p.m., Northwest Trek Wildlife Park, 11610 Trek Drive E., Eatonville; $4-$9.50, half price admission for military with ID (360-832-7166).

Today, tomorrow

Seattle Fiestas Patrias

Celebrating Mexican independence and the culture of Mexico and other Latin American countries with multicultural entertainment, food, crafts, noon-8 p.m. today, noon-6 p.m. tomorrow, dance 8 p.m.-1 a.m. today, Seattle Center, Seattle (206-684-7200 or www.seattlecenter.com).

Reptiles Around the World

Reptile exhibits and information, 10 a.m.-6 p.m. today and tomorrow, Pacific Science Center, 200 Second Ave. N., Seattle; $7-$10 (206-443-2001).

Lake Union Boats Afloat Show

Power and sailboats on display, sailboat rides, vendors, 10 a.m.-6 p.m. today and tomorrow, Chandler's Cove, 901 Fairview Ave. N., Seattle; $5-$10 (206-748-0012 or www.boatsafloatshow.com).

Puyallup Fair

Entertainment, rides, food, grange and agricultural displays, petting zoo, arts and crafts, floral and landscape exhibits, 10 a.m.-10 p.m. daily, rides open until 11 p.m. Fridays and Saturdays, through Sept. 25; Latino Celebration Day entertainment, food and vendors, noon-9 p.m. Sunday; Western Washington Fairgrounds, 110 Ninth Ave. S.W., Puyallup; $6-$10 (253-841-5045 or www.thefair.com).

La Fiesta Viva

Latino entertainment, arts and crafts, food, pony rides and information from health, social, business and educational organizations, 10 a.m.-6 p.m. today, 11 a.m.-5 p.m. tomorrow, Country Village, 23732 Bothell-Everett Highway, Bothell (425-821-1127 or www.FiestaViva.org).

Rainier Mountain Festival

Trail run, retail sale, salmon bake 'n' brews, kids' games, live music, 9 a.m.-6 p.m. today and tomorrow, Rainier Base Camp, 30027 SR 706 E., Ashford; free (800-238-5756 or www.rainierfestival.com/).

Tomorrow

Bug Blast

Information on bug collecting, bug specimens from around the world, live bugs, spider displays, children's activities, bug experts to identify your bug collections and answer questions, 10 a.m.-4:30 p.m., Burke Museum of Natural History and Culture, University of Washington, Seattle; $5-$8 (206-543-5590).

Kayak demo for all

Free kayak demonstration for people of all abilities, 1-5 p.m., Green Lake Community Center, 7201 E. Green Lake Drive N., Seattle; free; preregistration recommended for groups of six or more and people with disabilities (206-615-0617).

Urban Monkeys open house

Meet the instructors and see the new facility for dance, yoga and music classes for kids infant-age 6; 10 a.m.-2 p.m. Sunday, Urban Monkeys, 1124 Harrison St., Seattle (206-262-9282).

Bicycle Sunday

Scenic Lake Washington Boulevard and Seward Park four-mile route for bike riders, closed to motorized vehicles, 10 a.m.-6 p.m., Lake Washington Boulevard South from Mount Baker Beach to Seward Park, Seattle (206-684-4075).

Pike Place Market

Buskers' Festival

The Pike Market Performers Guild singers, songwriters, jugglers, a cappella groups, magicians, balloon artists, dancers, and musicians of all kinds, 10 a.m.-5 p.m., Pike Place Market, 1501 Pike Place, Seattle; free, tipping appreciated (206-330-6011).