Etc.

Crafts in Gaithersburg

• The 33d Annual Sugarloaf Crafts Festival. Four hundred fine artists and craft designers in pottery, paintings, puzzles and more. Demonstrations, children’s entertainment, music, food. Montgomery County Fairgrounds, 16 Chestnut St., Gaithersburg. 10 a.m.-6 p.m. April 4 and 5; 10 a.m.-5 p.m. April 6. $7 in advance, $8 door, good for all three days. Children under 12 free. Parking free. Advance tickets at www.sugarloafcrafts.com.

Potomac cleanup

• The 20th Annual Potomac River Watershed Cleanup. Volunteers pick up trash from cleanup sites around the region. Fifteen sites in the District, 51 in Montgomery and Prince George’s counties; 107 in Alexandria, Arlington and Fairfax. Sponsored by the Alice Ferguson Foundation. 9 a.m.-noon April 5. Rain or shine. Find sites through 301/292-5665 or www.potomaccleanup.org/trash_initiative/rc_sites.html

Tartans on parade

• National Tartan Day. The annual celebration of Scottish-American heritage commemorates the A.D. 1320 Declaration of Arbroath, which Scots consider their Declaration of Independence. Bagpipes, Celtic music, gathering of Scottish clan associations. Sponsored by the National Capital Tartan Day Committee. Market Square, 300 block of King Street, Old Town Alexandria. Noon-4 p.m. April 5. Free. 703/212-7137, www.tartandaydc.org