Wildlife conservation lecture: 2:30 p.m., Meadows Branch Library, 4800 Baseline Road, Boulder. The Boulder County Audubon Society presents an Earth Day lecture on wildlife conservation. Learn about local species, conservation challenges and how to help protect the planet’s biodiversity. calendar.boulderlibrary.org.

Monday Musical Storytime: 10:15 a.m., Boulder Public Library, 1001 Arapahoe Ave., Boulder. Get ready to dance and sing during this live story time full of songs, musical stories and more. All ages are welcome. Children must be accompanied by an adult. calendar.boulderlibrary.org.

Toddler Explorers: 10:15 a.m., George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Toddlers explore and learn through hands-on activities that focus on creativity and fun. Imaginations run wild while building foundational skills. calendar.boulderlibrary.org.

Boulder County Film Commission happy hour: 5 p.m., Dairy Arts Center, 2590 Walnut St., Boulder. Join a casual happy hour cohosted by The Boulder County Film Commission and Boulder Chamber member Rob Shearer. Come to network and enjoy the cash bar. Afterward, attend the Classics with Jeffrey Kash screening of Frank Capra’s “Forbidden” at 7 p.m. Tickets for the film sold separately. This is a great opportunity to meet with members of the Boulder film community and share in a mutual love for film. Registration required. Free, event brite.com.

“Dazzle of Darkness” exhibition: 11 a.m. Tuesday, Boulder Museum Of Contemporary Art, 1750 13th St., Boulder. This exhibition showcases 31 artists who illuminate darkness through diverse media, ranging from storytelling to scientific experimentation, photography, fiber optics, film and sculpture. Their works expand awareness on personal, universal and spiritual levels. Free-$25, 303-443-2122, bmoca.org.

Boulder Crime & Justice forum: 4 p.m. Tuesday, Boulder Library Canyon Theater, 1000 Canyon Blvd., Boulder. Boulder’s top officials tackle crime, policy and enforcement with discourse that allows audience members to ask questions and engage in direct dialogue with the panel featuring chief of police, district attorney and city attorney. Free, eventbrite.com.

Boulder Cycling Club Tuesday Rides: 5:30 p.m. Tuesday, Twisted Pine, 3201 Walnut St., Boulder. The Boulder Cycling Club offers over 200 fun, challenging rides, with four weekly rides, a monthly mountain bike special outing and annual mountain trips and annual trip to Moab. Guests are welcome to join their first ride for free. The group will ride a minimum of 25 miles. Free, bouldercyclingclub.org.

“The Peculiar Garden of Harriet Hunt” book signing: 6:30 p.m. Tuesday, Boulder Book Store, 1107 Pearl St., Boulder. Chelsea Iversen will speak about and sign her new book “The Peculiar Garden of Harriet Hunt.” At once mesmerizing and fiercely feminist, the book makes for the perfect modern fairytale about women taking control of their lives with a little help from the magic within them. $5, eventbrite.com.

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