BikeJam at Patterson Park
Pedal your family to Patterson Park Saturday for high-speed Pro-Am and mountain-bike racing, bike exhibits, a bike parade, stunt-cycling demonstrations, a bike rodeo, safety demonstrations and a bicycle-theme art exhibition. The second annual Baltimore BikeJam also features hands-on projects for children, a Bike Deco Derby with cash awards, strolling entertainers, live music and plenty of food. The event kicks off at 9:30 a.m. with more than 350 professional and amateur cyclists racing through the park at speeds close to 40 mph. Racing continues to 5:30 p.m., and festival activities run from 11 a.m. to 5:30 p.m. Admission is free. Call 410-342-0600.
Memorial Day ceremony
Three Maryland servicemen who were killed in a terrorist attack on the USS Cole last October will be honored during Memorial Day observances at 11 a.m. Monday at the Circle of the Immortals, Dulaney Valley Memorial Gardens, 200 E. Padonia Road, Timonium. The traditional ceremony, which salutes men and women of the armed forces who lost their lives in the defense of the country, includes the pageantry of the 229th Maryland Army National Guard Band and color guard units from the United States Navy, Maryland National Guard and the 1st Marine Division Association. John McDermott, an Irish tenor and supporter of veterans' affairs, will also perform at the free ceremony. Call 410-666-0490.
Explore science fiction, fantasy and fandom in literature, art, film, costumes, games, music and more this weekend during Balticon 35 at the Wynd-ham Baltimore Inner Harbor Hotel, 100 W. Fayette St. At the four-day Maryland Regional Science Fiction Convention, you can attend panel discussions, author readings, art shows and science briefings. Also, dress in your favorite galactic costume for a masquerade competition, visit dealer rooms, bid at a charity auction, enjoy demonstrations and other events. You will also meet legions of celebrity guests, including author Hal Clement, artist Helen "Halla" Fleischer and filk artist Frank Hayes. Hours are 4 p.m.-2 a.m. tomorrow, 10 a.m.-2 a.m. Saturday, 10 a.m.-11 p.m. Sunday, 10 a.m.-3 p.m. Monday. A weekend pass is $45; one-day passes are $15-$30. Call 410-563-2737.
MICROBES INVADE SCIENCE CENTER
The smallest forms of life on Earth make their debut at the Maryland Science Center when the 5,000-square-foot interactive exhibit "Microbes: Invisible Invaders ... Amazing Allies" opens Saturday at the Maryland Science Center. Visitors will be able to explore how microbes cause diseases and how they are also used to fight infections. Kid-friendly technology includes a virtual microbe combat game and the Gobble De Goop video game that munches microbes as they consume an oil spill. The exhibit is open through Sept. 23. The museum is located at 601 Light St. Hours vary. Admission is $10-$18. Call 410-685-5225.
Baltimore Herb Festival
A heap of herbs -- from rosemary, basil, tarragon and sage (this year's featured herb) to thyme, chives, lavender and violets (yes, violets are herbs) -- will be offered Saturday at the 15th annual Baltimore Herb Festival in Leakin Park, Windsor Mill Road. From 10 a.m. to 5 p.m., you can learn to cook with herbs, buy herbs, sample herbed food, attend lectures on herbs, take woodland walks and train rides, and browse among information and craft booths. Admission is $4. Call 410-448-1281.
Maceo Parker at Hammerjacks
When Hammerjacks presents the first major concert at its new location (316 Guilford Ave.) Sunday evening, forget rocking to heavy-metal music. Instead, you'll be treated to the legendary funky sounds of saxophonist Maceo Parker. The musician is known for his work with James Brown, but for the past decade he's been performing solo, headlining concerts in this country as well as in Europe and Japan. Joining Parker for the evening of funk will be Rock and Roll Hall of Famer Bernie Worrell and the WOO Warriors. The concert starts at 9 p.m. Tickets are $20. Call 410-481-SEAT.
'Base Camp: Rhino'
Do you know how much a white rhino weighs, or how a zoo keeper can train such a large animal to step onto a scale? When you visit "Base Camp: Rhino" at the Baltimore Zoo Saturday through Labor Day, you'll find the answers to those questions and more. The African Watering Hole exhibit has been transformed into a working field camp as zoo keepers study the endangered southern white rhinoceros, zebra and ostrich that occupy the site. Visitors to the camp are invited to assist in the day-to-day operations of the field research station. Hours are 10 a.m. to 4 p.m. daily with extended summer weekend hours. The zoo is in Druid Hill Park. Admission is $6 and $10, free under 2. Call 410-366-LION.