This Weekend in Belmont: Solstice Sackbuts in Saturday 'Sliding' Concert

• The Belmont Public Library's "Music on Saturday" concert series presents "Sliding Through the Ages" with the Solstice Sackbuts, a trombone tour-de-force performing music from the the medieval and Renaissance age to modern classical, pop and jazz. David Lindsey, Alan Johnson and Leslie Havens play soprano, alto, tenor and bass trombones in a concert filled with interesting anecdotes about the composers and times and history of the trombone. All are welcome to attend this free concert that will take place in the Assembly Room from 3 p.m. to 4 p.m. Saturday, May 4. Sponsored by the Friends of the Belmont Public Library.

• Saturday, May 4 at 7 p.m. is the final performance of "Once Upon a Mattress" begin performed by the students of the Chenery Middle School. $10 for adults and $8 for kids.

• What began in the first year of World War II continues today as the  holds its 71st annual "rummage" sale on Saturday, May 4 between 9 a.m. and 2 p.m. at the church located at 404 Concord Ave. near the intersection of Common Street.

• Come and celebrate Cinco de Mayo at Paprika Kids located at 404 Trapelo Rd. Sunday, May 5. Learn Spanish words while you play bingo and do fun activities. Also see some Mexican piñatas.

11 a.m.: Mexican bingo

1 p.m. to 4 p.m.: Cinco de Mayo's arts and craft open table.

• Square Dance for Everyone will be holding its monthly "four-hands" event on Saturday, May 4, from 8 p.m. to 11 p.m. at Payson Park Church, 365 Belmont St. Explore the many and varied styles of traditional square dance along with a few classics from the early days of modern square dancing. No classes, no costumes and no commitment required. Newcomers are welcome, singles or couples. Called by Tony Parkes, music by Amy Cann and friends. All for a measly $10.