Vocalist Mary Louise Lee will perform at Lone Tree Arts Center on July 24 and 25 at 8 p.m., and The Collective, with singer Hazel Miller, will star on Aug. 14 and 15. What a treat on a summer night! LTAC is at 10075 Commons St., Lone Tree. Box office: 720-509-1000, lonetreeartscenter.org.

Easing into opening

Bemis Library at 6014 S. Datura St., Littleton, opened July 14 with limited hours: Tuesday to Friday: 1 to 6 p.m.; Saturday: 10 a.m. to 3 p.m. Call to schedule a same-day appointment: 303-795-3961, as the number of visitors at any one time will be limited. All returns should be in the outdoor book drop. Computer sessions will be limited to one hour. Chat reference service Monday to Friday, 9 a.m. to noon. Mask or face coverings for staff and visitors required — stay 6 ft. away from non-family members.

Littleton Museum

The Littleton Museum, 6028 S. Gallup Street, Littleton is open limited hours, with prescheduled visits limited to one hour, between 10 a.m. and 3 p.m. Wednesday through Saturday. 303-795-3950.

Farmers market

Highlands Ranch Farmers Market at 9288 Dorchester St. is open Sundays through Nov. 1, from 10 a.m. to 2 p.m.

Douglas Land Conservancy

The Douglas Land Conservancy is in the final week of seeking photos for its Natural Douglas County note cards. Landscapes, wildlife or any other natural feature of Douglas County are eligible as subjects for the contest, which has a deadline of July 31. For details, go online to douglaslandconservancy.org/upcoming-events/natural-douglas-county-note-card-contest.

ROX Arts Gallery open

The ROX Arts Gallery at Aspen Grove, 7301 S. Santa Fe Drive in Littleton, is open Wednesday to Saturday from noon to 7 p.m. and Sunday from 11 a.m. to 6 p.m. Inquire about classes and visits as the gallery is not at full speed yet and can allow 10 people with masks inside at a time, including members. 720-724-5730.

Denver Botanic Gardens

The Denver Botanic Gardens complex is at least mostly open to visitors and the Denver Museum of Nature & Science just reopened. For details, see botanicgardens.org and dmns.org.

Denver Art Museum

The Denver Art Museum is open and features an exhibit of Norman Rockwell’s very- American works. Timed tickets: dam.org.

As for what used to be known as the musuem’s North Building (now called the Martin Building in recognition of a $25 million gift from J. Landis and Sharon Martin), it closed for a major renovation in November 2017; now it’s reopening in stages ahead of a planned late 2021 grand unveiling.

Kirkland Museum

Kirkland Museum at 12th Avenue and Bannock Street, across from the Denver Art Museum, is open to visitors, as is the Museum of Contemporary Art Denver, 1485 Delgany St. Tickets: See kirklandmuseum.org and mcadenver.org.

Museum of Outdoor Arts

The Museum of Outdoor Arts’ indoor gallery at 1000 Englewood Parkway features an exhibit of works by Robert Rauschenberg. See moaonline.org.

Colorado Symphony

Colorado Symphony has canceled concerts through Oct. 31. Call the box office by June 30 about options if you hold early-season tickets to exchange or donate. 303-623-7876.