Saturday-Sunday. Hear that whistle blowing? It’s the Rocky Mountain Toy Train Show, pulling into the Denver Merchandise Mart for the weekend. The show caters to train fans of all ages, from experienced collectors and builders to just-getting-started youngsters. See static and operating model railroads, shop for gear and learn about real-life railroad adventures. In the Kids’ Corner, children can play with hands-on train sets, listen to stories and even watch train-themed movies. 10 a.m. to 5 p.m. Saturday and Sunday. Denver Merchandise Mart, 451 E. 58th Ave.; 303-292-6278. Admission is $8; free for military and scouts in uniform and kids younger than 12. Learn more at rockymountaintoytrainshow.com.

Through Sunday. Indians from all over gather in Denver this weekend for the 37th annual Denver March Powwow. The event is open to the public and features an arts and crafts show, storytelling and lots of dancing and drumming. Watch dance contests in a variety of categories—traditional, women’s and girls jingle dresses, boy’s fancy dress and more. Each round of contests begins with a Grand Entry processional and introduction of powwow royalty. The competition concludes on Sunday with the crowning of the 2011 Denver March Powwow Princess and announcement of dance contest winners. 10 a.m. to 10:30 p.m. Friday, 10 a.m. to 11:30 p.m. Saturday, 10 a.m. to 9:30 p.m. Sunday. Denver Coliseum, 4600 Humboldt St.; 720-865-2475. Admission is $7 per day for adults, $3 a day for elders age 60 and older. Kids age 6 and younger are free. A 3-day pass is $20. For more information, including a full schedule of events, visit denvermarchpowwow.org.

Through Sunday. Celebrate Celtic pride when the Denver Brass presents “Brass, Bagpipes and Company: Slainte!” The St. Patrick’s Day extravaganza brings together dancers, pipers and brass players for a lively show of spirit. While Irish and Scottish Highland dancers do their steps, the Denver Brass joins with traditional Celtic musicians and singers. There are some new elements in store this year, too, like a drumline salute and the reliable tearjerker “Danny Boy.” 7:30 p.m. Friday, 2 p.m. and 7:30 p.m. Saturday, 2:30 p.m. Sunday. Newman Center for the Performing Arts, 2344 Iliff Ave.; PHONE. Tickets are $24-$43, with discounts for seniors, students and kids age 12 and younger. Buy tickets and learn more at denverbrass.org or call 303-832-HORN.

Wednesdays through April 27. Looking for a new hobby? Visit the Children’s Museum of Denver on Wednesdays and learn the ukulele with Swallow Hill Music. The weekly “Sing and Strum-A-Long” will have students strumming a song in about 30 minutes. The classes are best for kids age 5 and up, but anyone can come along. Don’t have a ukulele? Don’t worry: Swallow Hill will have ukes on hand. Arrive early, though—the classes are first come, first served. 5 p.m. Wednesdays. Children’s Museum of Denver, 2121 Children’s Museum Drive; 303-433-7444. Lessons are included in the price of admission: $8 for guests ages 2 to 59, $6 for 1-year-olds and seniors age 60 and older. Visit mychildsmuseum.org for more information.

Saturday. Learn all about high-country fun at Mountain Fest, presented by the Colorado Mountain Club. The free event features all sorts of outdoorsy fun, including clinics on hiking, fly fishing, climbing and preparing for mountain weather. There’s an indoor climbing wall, too, for those who just can’t wait to start scrambling up the hills. Learn about the CMC’s various programs, too, and take a spin through the Mountaineering Museum. Grownups can have a drink when happy hour rolls around, complete with a live band. 1-6:30 p.m. Saturday. American Mountaineering Center, 710 10th St., Golden; 303-279-3080. Admission is free. For more information, visit www.cmc.org.

-Kathleen St. John