Jun. 21—Today

Boulder Bike Show: Head to Upslope Brewing in Flatiron Park for the return of this coveted bike show competition. There will be many creative bike categories, each with prizes awarded as judged by the audience. REI Boulder will lead a no-drop gravel ride at 4 p.m., ending at the bike show; 5 p.m. Wednesday, Upslope Brewing Company, 1898 S. Flatiron Court, Boulder; free; walkandbikemonth.org.

'Big Astronomy — People, Places, Discoveries': "Big Astronomy — People, Places, Discoveries" explores three observatories located in extreme environments and remote locations in Chile. Due to its special climate and location, Chile is one of the best places in the world for astronomy. With a focus on STEM, the film highlights the multitude of careers needed to keep the great observatories working; 12:30 p.m. Wednesday, Fiske Planetarium, 2414 Regent Drive, Boulder; $8-$12; calendar.colorado.edu.

'Carrion Calls' book party: Boulder-based poet Danielle Wednesday will perform a dramatic reading of her new poetry collection "Carrion Calls." Interview, reading, book sale and signing will take place after the reading; 6 p.m. Wednesday, Trident Café, 940 Pearl St., Boulder; tridentcafe.com.

Summer solstice flow at the farmers market: Join YogaPearl at the farmers market for a special outdoor yoga flow to celebrate the summer solstice; 6:30 p.m. Wednesday, Boulder farmers market, 13th Street, Boulder; clients.mindbodyonline.com.

Upcoming

O'Neill Sprunt Lamb Band at The Velvet Elk Lounge: O'Neill Sprunt Lamb Band is a five-piece, jam-oriented band composed of Caleb O'Neill, drummer Tyler Tullar and guitarists Brian Heekin, Chris Sprunt and Jude Shaw. They are influenced by Grateful Dead, King Gizzard and The Lizard Wizard; 9 p.m. Thursday, The Velvet Elk Lounge, 2037 13th St., Boulder; $10; velvetelklounge.com.

Local musician showcase at BOCO Cider: Thomas Dow will host this local musician showcase featuring some powerful local talent. Performers include Antonio Lopez, Teresa Storch and Peter Lacis, Meghan Cave, Brenda Kahn, Rick Franz, Songbabe and Mike Pesci. Each artist will be performing for 15 minutes; 6 p.m. Thursday, BOCO Cider, 1501 Lee Hill Drive, Unit 14, Boulder; free; bococider.com.

'Top Gun — Maverick' outdoor screening: This year, the Downtown Boulder Triple Crown Race Series is back and better than ever. Run, jog, skip or walk a mile, and then stick around for an outdoor screening of "Top Gun: Maverick" shortly after sunset; 9 p.m. Thursday, 10th Street, 2001 10th St., Boulder; free; boulderdowntown.com.

Thursday jazz jam: Bring an instrument and jam out at Trident's new third Thursday jazz jam. Sit in with a house band of Boulder's finest improvisors to play and solo over classic jazz standards. The event will be hosted by Pedro Urbina of Thunderboogie; 5:30 p.m. Thursday, Trident Café, 940 Pearl St., Boulder; free; tridentcafe.com.