“The Pirates of Penzance” play: 7:30 p.m. Friday, Macky Auditorium, 1595 Pleasant St., Boulder. Prepare for a hilarious high-seas escapade filled with love, laughter and a boatload of pirate shenanigans. Join the lovestruck Frederic and his rambunctious crew of bumbling buccaneers as they navigate the choppy waters of romance and loyalty. With familiar tunes, stunning visuals and exceptional talent, the CU Boulder College of Music Eklund Opera Program brings Gilbert and Sullivan’s hilarious hijinks to life with a whole lot of pirate swagger. $17-$53, 303-492-8008, cupresents.org.

Pi Day Mathematics Festival: 5:30 p.m. Friday, George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Celebrate Pi Day — and math in general — through hands-on puzzles, games and art. All ages are welcome. calendar.boulderlibrary.org.

Rich Chiaraluce Quintet performance: 6:30 p.m. Friday, Full Cycle Café & Bar, 2355 30th St., Boulder. The Rich Chiaraluce Quintet will perform the music of the Cannonball Adderly Quintet — one of the most famous groups in the history of jazz. Cannonball was soulful, swinging and funky. Starting in the late 60s and into the early 70s, as the jazz audience started changing, Cannonball also changed with the new style combining rock, gospel and straight-ahead. $20-$25, fullcyclecafebar.eventcalendarapp.com.

“Testing 1-2-3” opera concert: 7:30 p.m. Friday, Christ of Science Church, 2243 13th St., Boulder. Attend a special concert series at a potential new home for Boulder Opera. The group’s finest singers will test the acoustics and energy of the space by performing arias and scenes from a variety of beloved operas. Drinks and light snacks will be available. A second performance will take place at 4 p.m. Sunday. Pay what you can, boulderoperacompany.com.

World’s Shortest St Patrick’s Day Parade Beer Garden: 11 a.m. Saturday, 16th Street between Pearl and Spruce, 1543 Pearl St., Boulder. Celebrating Irish culture and community spirit, the festivities feature live music, food trucks and plenty of Irish cheer. The parade kicks off at noon, showcasing a unique lineup of Irish dancers, bagpipers, wolfhounds, cruiser bikes and the ever-entertaining Paddy ‘O Furniture Drill Team. Free, 303-579-9700, boulderoddfellows.org.

St. Patrick’s Puppy Parade: 11 a.m. Saturday, Boulder Social, 1600 38th St., Boulder. Check out the second annual parade and costume contest for furry friends in their green garb. Activities include nail trims, party pictures, giveaways and Irish food specials. $10, 720-716-3345, eventvesta.com.

Jeff Nathanson performance: 6:30 p.m. Saturday, Full Cycle Café & Bar, 2355 30th St., Boulder. Multi-saxophonist and EWI stylist Jeff Nathanson will be returning to Full Cycle with his world class band Tonal Triage. The group performs Latin-infused and inspired melodies, crafted jazz standards, beautiful ballads and more. $20-$25, fullcyclecafebar.eventcalendarapp.com.

The Wellermen performance: 8 p.m. Saturday, The Velvet Elk Lounge, 2037 13th St., Boulder. Known for its signature blend of sea shanties and folk-inspired harmonies, The Wellermen offer listeners centuries-old traditional folk songs with a new sound on their latest album “Northern Sky”. $25, 303-993-8743, etix.com.

Editor’s note: Availability and scheduling of events may be subject to change.