INTRODUCTORY COMPUTER CLASS, for ages 55 and older; teaches how to use a mouse and navigate the Windows desktop; class limited to five participants. 10 a.m., Thurmont Branch Library, 11 Water St., Thurmont. Free; registration required. 301-271-7721.
FREDERICK CHESS, teaches how to play and new tactics. 10:30 a.m.-noon, C. Burr Artz Public Library, 110 E. Patrick St., Frederick. Free. 301-694-1630.
FREDERICK OKTOBERFEST, a German heritage celebration with oompah bands, Alpine dancers, polka contests, strong-person contests, yodeling, a beer garden, food, a children's tent and activities, a hobby tent featuring model trains; sponsored by (and proceeds to benefit) Community Living Inc. and the Fredericktowne Rotary Club. Noon-10 p.m. Saturday and noon-6 p.m. Sunday, Frederick Fairgrounds, 797 E. Patrick St., Frederick. $5; children 11 and younger, free; parking donation requested. 301-663-8811.
FARM MUSEUM FALL FESTIVAL, hayrides, farm exhibits, animals, music, food and crafts. 10 a.m.-4 p.m. Saturday (tractor pull and butchering demonstration in the morning) and noon-4 p.m. Sunday (cake auction and apple butter boiling), Rose Hill Manor Park, 1611 N. Market St., Frederick. Free; parking, $1. 301-694-1650.
FREDERICK SINGLES DANCE, music by a disc jockey, snacks and a cash bar. 6:30-10 p.m., Holiday Inn, Francis Scott Key Mall, routes 85 and 355, Frederick. $7. 301-682-6174.
DANCE LESSONS, Mike Santos gives introductory lessons in ballroom, swing, and Latin dance. 7 p.m., Emmitsburg Branch Library, 300A S. Seton Ave., Emmitsburg. Free. 240-629-6329.
MIDDLETOWN AUTHOR LECTURE, local writer Roy VanDerLinden discusses his book "The Darking." 7-8 p.m., Middletown Branch Library, 101 Prospect St., Middletown. Free. 301-371-7560.
DISABLED ADULTS SUPPORT GROUP, a discussion about discipline, nutrition, medical, schooling and neighborhood issues; a chance to meet other parents with the same concerns. 10:30 a.m. Tuesdays, the Arc of Frederick County, 620A Research Dr., Frederick. Free; registration required. 301-663-0909 or 301-663-0936 (TDD).
YOUTH GROUP, for ages 11-15, discuss books, movies, school and life. Snacks provided. 3:15 p.m., Middletown Branch Library, 101 Prospect St., Middletown. Free. 301-371-7560.
FREDERICK BUSINESS CLASS, "How to Start Your Own Business" covers regulatory requirements, legal structures, crafting a business plan and other money matters, sponsored by the Maryland Small Business Development Center. 6:30-8:30 p.m., C. Burr Artz Public Library, 110 E. Patrick St., Frederick. Free. 301-694-1630.
MOVIE MAKERS CLUB, for children in grades 6-12, an opportunity to learn the basics of filmmaking and share experiences and resources to make movies; the goal is to host a film fair and show films produced by the club. 7-8 p.m. the first Tuesday of each month, Emmitsburg Branch Library, 300A S. Seton Ave., Emmitsburg. Free; registration required. 240-629-6329.
CIVIL WAR LUNCH LECTURE, a museum staff member discusses "Archaeology at Monocacy Battlefield." 12:15-1:15 p.m., National Museum of Civil War Medicine, 48 E. Patrick St., Frederick. $2. 301-695-1864.
YOUTH KNITTING CLASS, for children in grades 6-12, learn the basics of knitting, make a simple scarf. 3:30 p.m., Middletown Branch Library, 101 Prospect St., Middletown. Free. 301-371-7560.
BOOK CHARADES, for children in kindergarten through fifth grade, act out a popular children's book so that others can guess its name. 4:15 p.m., Brunswick Branch Library, 915 N. Maple Ave., Brunswick. Free. 301-834-9065.
THURMONT AUTHOR LECTURE, local writer Jeff Yocum discusses his new book, "The Eyes of God," and his passion for his craft. 7 p.m. Thurmont Branch Library, 11 Water St., Thurmont. Free. 301-271-7721.
-- Compiled by TINA TOLL
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