Big Head Todd and the Monsters — Big Head Todd and the Monsters, marking 30 years of music-making, will return to the band's old Boulder stomping ground; 8:30 p.m., Boulder Theater, 2032 14th St., Boulder; $46-$51; bouldertheater.com.
The Mighty Twisters Trio — The Mighty Twisters Trio are T Valladares and Dave Gunders on vocals and guitars, and Maria Valladarez on vocals. This is a smaller, more intimate version of the full band, which plays reggae, ska, rock, Motown, and blues; 7:30 p.m., Dannik's Gunbarrel Corner Bar, 6525 Gunpark Drive, Suite 380, Boulder; free; 303-499-4574, danniks.com.
Mentalpause! — Dairy Comedy presents Mentalpause!; 8:30 p.m.,, Dairy Arts Center, 2590 Walnut St., Boulder; $10-$12; 303-440-7826, thedairy.org.
Boulder Comedy Show — Boulder Comedy Show, established in 2013, is a weekly live standup comedy showcase featuring distinguished comedians from across the country, with credits such as Comedy Central, MTV, Vice, HBO, NBC and TruTv. The show runs every Sunday, with two shows at 7 and 9:15 p.m. Sunday, Bohemian Biergarten, 2017 13th St., Boulder; $5; 720-767-2863, bouldercomedyshow.com.
Christmas morning visit to Boulder Nursing Home — A Christmas morning visit is planned by volunteers to a local nursing home caroling and visiting residents and sharing the Christmas spirit. It's a time of the year when many people who are confined feel particularly alone and forgotten; the visit last about an hour. A little of your time will make a big difference in your life and in the life of someone else; 10 a.m., Monday, Nursing Home, 2121 Mesa Drive, Boulder; free; 303-333-3747, holidayproject.info.
Monty Python and the Holy Grail — King Arthur and a band of misfits go on a low-budget search for the Holy Grail in the always-hilarious "Monty Python and the Holy Grail." The Boedecker in the Dairy Arts Center screens the film at 7 p.m. Monday, 2590 Walnut St., Boulder; $12; thedairy.org.
TED Talk screening and discussion — Golden West will screen the TED Talk "How the worst moments in our lives make us who we are" by Andrew Solomon. In the talk, writer Solomon will discuss the adversity he faced in childhood and the courageous people he's met throughout his life. RSVP by calling 303-939-0883; 10:30 a.m., Tuesday, Golden West, 1055 Adams Circle, Boulder; free; 303-939-0883.
The Christmas Revels: An Irish Celebration of the Winter Solstice — The Christmas Revels returns with a show steeped in Irish music, dance and story-telling. Experience the hopes and dreams of families seeking a better life in America, with jigs and reels, step dancing, and our chorus of adults and children; 2 p.m., Tuesday, Dairy Arts Center, 2590 Walnut St., Boulder; $20-$28; 720-593-1454, rockymountainrevels.org.
Open Mic Night — Show what you've got, or sit back and listen to some of Boulder's most talented musicians and poets; 6 p.m., Tuesday, Twisted Pine Brewing Company, 3201 Walnut St., Boulder; free; 303-786-9270, twistedpinebrewing.com/calendar.
Open Stage-Hosted by Danny Shafer — Danny Shafer's open mic, a Boulder institution, is planned for 7:30 p.m., Tuesday, Oskar Blues Tap rooom, 921 Pearl St., Boulder.