A public symposium on eliminating hazards that contribute to asthma attacks will be held from 1 p.m. to 3 p.m. in the Berman Auditorium at the Downtown Center of the Johns Hopkins University, 10 N. Charles St. The symposium is part of a daylong state-sponsored environmental public health tracking conference. 410-767-5049.
Aberdeen's free summer concert series will continue with a performance by the 389th Army Band from 7 p.m. to 8 p.m. at Festival Park. In the event of inclement weather, the performance will be moved to the multipurpose room at Aberdeen Middle School. 410-939-6767.
The Carroll County Commission Redistricting Committee will meet at 7 p.m. in Room 003 of the County Office Building to finalize its recommendations on the establishment of districts for the election in 2006 of a five-member Board of County Commissioners. 410-386-2030.
Bear Branch Nature Center will hold a morning bird walk from 8 a.m. to 10 a.m. at 300 John Owings Road, Westminster. The cost is $1 for members and $2 for nonmembers. Registration is required. 410-848-2517.
A concert of Creole and funk by Rita Clark and the Naturals, scheduled for 7 p.m. at Centennial Park South, will conclude the summer series presented by Comcast and Howard County Department of Recreation and Parks. The concert is free; parking is $3. 410-313-7275.
The Maryland Farmers' Market will be open from 2:30 p.m. to 6:30 p.m. at the east Columbia library, 6600 Cradlerock Way, Columbia.FRIDAY
Women's suffrage parade
The Howard County League of Women Voters and the Howard County Commission for Women will sponsor a parade at 2 p.m. and a commemorative program at 3 p.m. to celebrate the 85th anniversary of the 19th Amendment, which guaranteed women's right to vote. The parade will proceed through the Ellicott City Historic District to the Thomas Isaac Log Cabin site, where the program will be held. 410-730-0142.
Native American festival
A powwow and Native American festival will be held from noon to 8 p.m. at Patterson Park, Eastern and Linwood avenues. It will continue from 10 a.m. to 10 p.m. Saturday and from 10 a.m. to 6 p.m. Sunday. The event will include storytelling, games, face painting, live music and dance performances and food. Admission is $3. Saturday and Sunday admission is $5; $3 for children. 410-675-3535 or www.baic.org.
The eighth annual Wheelchair/Stand-up Bocce Tournament, sponsored by the Baltimore City Department of Recreation and Parks' Therapeutic Division, will be held from 10 a.m. to 5 p.m. at the Patterson Park bocce courts. Admission is free for spectators. The cost for a player is $12.50; the cost is $50 for a four-person team. 410-396-7072.
The Maryland Renaissance Festival will open its annual presentation with performances from 10 a.m. to 7 p.m. at the festival grounds, 1821 Crownsville Road, Crownsville. The festival, which re-creates a 16th-century English village and features 10 stages of entertainment and a jousting arena, will continue Sunday and weekends through Oct. 23. Daily tickets are $17, $15 for seniors, $8 for ages 7 to 15, and free for age 6 and younger. A two-day pass is $26; a pass for all 19 days of the festival is $70. 800-296-7304. www.rennfest.com.
New Windsor concert
New Windsor will sponsor a free summer concert by the Flying Scotsman at 6 p.m. at the gazebo at Route 75 and Main Street. In event of rain, concerts will be held in the fire hall on Main Street. Visitors should bring a lawn chair. 410-635-6575.