HAPPENINGS
Lincoln: Cinco de Mayo celebration Friday, 7:30 p.m. at Bemis Hall. Dancing to music by Alter Ego. 781-259-9471.
Medway: Medway Contra Dance will be held Saturday, 7:30-10:30 p.m., at Christ Episcopal Church, 14 School St. Beginners welcome, no partner necessary. $7, teens half price, ages 12 and under free. 508-740-8508.
Newton: Friends of the Newton Free Library book and author luncheon, at noon Friday at the Boston Marriott Newton, will feature Stephen Puleo and Anne Easter Smith. $35. 617-997-7942.
MUSIC
Franklin: Singer-songwriter Susan Werner (below) performs Saturday, 8 p.m. at the Circle of Friends Coffeehouse, First Universalist Society meetinghouse, 262 Chestnut St. Pat Wictor opens. $20. 508-528-2541, circlefolk.org.
Northborough: Assabet Valley Mastersingers presents "The Armed Man: A Mass for Peace," by Karl Jenkins, with the Algonquin Regional High School Chorus, Saturday, 8 p.m. at Algonquin Regional High School. 978-562-9838, avmsingers.org.
Sudbury: The combined choirs of Memorial Congregational Church and First Baptist Church in Worcester present Mendelssohn's "St. Paul" on Saturday, 7 p.m. at Memorial Congregational, 26 Concord Road. With William Ness, organ; Cheryl Medeiros Nancarrow, soprano; Diana Daly Bettit, mezzo; Jason McStoots, tenor; and John Whittlesey, baritone. $5-$10. 978-443-3885.
EXHIBITIONS
Wellesley: "Leeks and Chains," photographs by Wally Gilbert, on view through May 30 at Khaki Gallery, 9 Crest Road. 781-237-1095, khakigallery.net.
Send Best Bets items three weeks in advance to Globe West, 111 Speen St., Framingham, MA 01701, or e-mail westarts@globe.com.
