Marco Pinter — When a body leaves a space, what's left behind? California artist Marco Pinter in a new exhibit at the Dairy Arts Center explores the heat the human body leaves behind. Check out Pinter's "Thermal Gestures," a part of his "Less Ephemeral" exhibit, which is a highlight of three shows at the Dairy Arts Center, 2590 Walnut St., Boulder; $5 suggested donation; dairyarts.org.
Hike for Seniors — Enjoy a nature hike for seniors and learn about an area's history, wildlife and current resource management projects. No registration is necessary, however visitors should call in advance if they plan to bring a group so organizers have enough naturalists at the program. Meet at group shelter; 10 a.m., Rabbit Mountain Open Space, 14950 North 55th St., Longmont; free; 303-678-6214, bouldercounty.org/os/events/pages/default.aspx.
Harry Potter — Calling Hogwarts fans of all ages. Bring the family and make some great memories. Ages 7-plus welcome (without an adult OK); 2 p.m., Dabble Paint and Sip Studio, 2330 Main St., Unit E, Longmont; $30; dabblepaintandsip.com.
Open Bluegrass Jam — A bluegrass jam open to all abilities is planned for 7 p.m., West Flanders Brewing, 1125 Pearl St., Boulder; free; 303-444-4093.
Polish Ambassador & Friends NYE in Boulder — Join The Polish Ambassador, Ayla Nereo and The Jumpsuit Records crew for three nights at the Boulder Theater for New Year's Eve — three nights with three completely different TPA sets and a different supporting cast each night. Dec. 31 will include a mish mash of guests, live music, collaborations and a good old fashion get down to bring in the New Year in the best way possible. Ayla Nereo Live Band and Ryan Herr open the night; 8 p.m., Friday, Boulder Theater, 2032 14th St., Boulder; bouldertheater.com.
Railroad Earth: Three nights — Railroad Earth performs a three-night run in Boulder for New Year's Eve; 8:30 p.m., Friday, The Fox Theatre, 1135 13th St., Boulder; foxtheater.com
Happy Hour Jazz with Holly DeHoog — Enjoy live happy hour jazz with Holly and the Husbands, featuring old jazz and new jazz; 5:30 p.m., Saturday, Tandoori Grill South, 619 S. Broadway, Boulder; free; 303-447-9772.
Last Year's Model — Last Year's Model is a three-piece rock band that creates original music inspired by the rock 'n' roll innovators of the 50s, 60s, 70s and 80s. These are heady dudes with interesting, yet accessible music and a passion for their craft. The group features Liam Downey on guitar, Mark Arroyo on bass and David Ross on drums; 7:30 p.m., Saturday, Dannik's Gunbarrel Corner Bar, 6525 Gunpark Drive, Boulder; free; 303-530-7423, facebook.com.
Groovealicious — Groovealicious plans to perform its Mile High mountain funk; 10 p.m., Saturday, Lazy Dog, 1346 Pearl St., Boulder; free; 415-250-4582.
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.