Marc Cohn and Shawn Colvin at Chautauqua Auditorium and other Boulder events for today

Jun. 20—Today

Marc Cohn and Shawn Colvin at Chautauqua Auditorium: Two of a generation's favorite singer-songwriters, Marc Cohn and Shawn Colvin, come together on stage for a special evening. Cohn, a Grammy Award winner for his soulful ballad "Walking in Memphis," and Colvin, winner of the Grammy Award's Record of the Year and Song of the Year for "Sunny Came Home," welcome fans into their decades-long friendship for a night of songs and stories; 7:30 p.m. Tuesday, Chautauqua Auditorium, 198 Morning Glory Drive, Boulder; $40-$53; z2ent.com.

Seán Johnson and The Wild Lotus Band at eTown: Celebrate the spirit of unity with a night of interactive, soul-stirring music from Seán Johnson and The Wild Lotus Band. Experience heart-expanding ancient mantras and global chants given new voice through dynamic songs that merge conscious lyrics and New Orleans roots, rock, gospel and world grooves; 6:15 p.m. Tuesday, Etown, 1535 Spruce St., Boulder; $30-$45; eventbrite.com.

Nina de Gramont and David Gessner book signing: Join Nina de Gramont and David Gessner for a celebration of the work and life of their friend, Mark Spitzer, author of "Monster Fishing: Getting Caught in the Ethics of Angling." They will also speak about and sign their new books "The Christie Affair" and "A Traveler's Guide to the End of the World"; 6:30 p.m. Tuesday, Boulder Book Store, 1107 Pearl St., Boulder; $5; boulderbookstore.net.

Boulder Evening Optimist Club: The Boulder Evening Optimist Club's mission is to plan, develop and implement projects, fundraisers and other activities within the Boulder community and to work with youth; 6 p.m. Tuesday, Greenwood and Myers Mortuary, Second Floor Conference Room, 2969 Baseline Road, Boulder; free.

Upcoming

'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.

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.

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.