The Institute for Learning in Retirement at Slippery Rock University is planning a public trip to Gettysburg on Sept. 8 and 9.

The trip includes a three-hour guided tour of the battlegrounds and visits to the President's Hall of Fame and the Jenny Wade House. Call 724-637-2982 for information.

MARS — Registration has begun for the children's summer reading program at the Mars Library, 107 Grand Ave.The following programs are planned:• Storytime for infants and toddlers with Miss Gloria starts at 10:30 a.m. June 15 and continues Wednesdays through July.• Storytime for ages 3 to 6 starts at 10:30 a.m. June 13 and continues Mondays, Tuesdays and Thursdays through July.• 11 a.m. June 14 ice cream social for all ages• Noon June 16, Flamenco Pittsburgh for ages 5 to adult• 1:30 p.m. June 22, Being a Kid in the Ancient World, ages 8 and up• 1:30 p.m. June 27, Travels in Asia with Miss Morgan, ages 6 and up• 11 a.m. to noon June 29, “Build It” Carnegie Science Center Camp, ages 7 to 14• 10:30 a.m. July 5, Little Linguists story time featuring Columbia for ages 3 to 5 with their families• 1:30 p.m. July 11, Travels in Europe with Miss Avery, ages 6 and up• 1 p.m. July 18, Conductor Jack Norton for all ages• July 23, last day of summer reading• 1 p.m. July 25, finale party with magician for all agesFor information or to register for programs, call 724-625-9048.

MARS — Mars United Presbyterian Church, 232 Crowe Ave., will hold a flea market starting at 7 a.m. Friday and Saturday. For information, call 724-625-1365.

HARMONY — The Harmony Museum's annual herb and garden fair will be held from 9 a.m. to 3 p.m. Saturday at the historical society's barn at 303 Mercer Road.Gardeners may trade potted plants. There will be vendors and a flea market.Donors and exchangers bringing plants to the fair receive vouchers for other plants.

The Butler County Historical Society will host its third annual wine and cheese event at 5:30 p.m. June 17 at Pullman Park.The program will be presented by Sean Gibson, great-grandson of baseball great Josh Gibson. Gibson was one of the greatest players in Negro League history, leading in home runs for 10 consecutive years. According to Richard Schnur’s “The Men of Summer Return,” he hit the longest home run ever hit in Pullman Park.For tickets, call 724-283-8116 or visit www.butlerhistory.com.