The 23rd annual Olde Towne Gaithersburg Day will feature entertainment on five stages, children's activities, food and select offerings from artists, craftspeople and local merchants. There will be musical performances by Still Surfin', a Beach Boys tribute band, and B2B, a Jimmy Buffet tribute band. At noon, a naturalization ceremony will be held to welcome new American citizens. There also will be a "Cruisin' Car Show" featuring classic and vintage automobiles. 11 a.m.-4 p.m. Sunday. East Diamond and Summit avenues, Gaithersburg. Free. 301-258-6350, www.gaithersburgmd.gov or firstname.lastname@example.org.
Shaker Forest Festival
A festival featuring strolling musicians, food vendors, artists and craft demonstrations. 10 a.m.-6 p.m. Saturday and Sunday. Seneca Creek State Park, 11950 Clopper Rd., Gaithersburg. $7; free, 10 and younger. 301-330-9144 or www.shakerforest.org.
'Crazy for You'
The Troika Organization's national tour of "Crazy for You," an adaptation of George and Ira Gershwin's "Girl Crazy" (1930). 8 p.m. tomorrow and Saturday. Montgomery College, Robert E. Parilla Performing Arts Center, 51 Mannakee St., Rockville. $24; $22, seniors and students. 301-279-5301.