Though the calendar (and weather) may disagree, the long, sticky summer comes to a mental end with Labor Day. For many museums and galleries, the holiday signals the start of a rousing month of shows, exhibitions and lectures. Others are wrapping up their summer seasons. Here’s a taste of what’s on tap in the coming weeks.

Miami-Dade

To showcase downtown Miami’s growing art scene, the Downtown Development Authority is holding the first DWNTWN Art Days Friday and Saturday, with free exhibition entries, studio openings, screenings, walking tours and a bike tour. A free trolley will run from 11 to 8 p.m. Friday and noon to 5 p.m. Saturday throughout the district. The full line-up of events is at www.dwntwnartdays.com. Among the many offerings:

Artist George Sanchez Calderon opens his studio from 3 to 5 p.m. Friday, 75 NW 12th St.

Miami Art Museum offers free admission to its Rashid Johnson exhibit (details below), from 10 a.m. to 5 p.m. Friday and noon to 5 p.m. Saturday.

Miami Film Festival International offers a free screening of Gerhard Richter Painting at Miami Dade College at 7 p.m. Friday.

New World School of the Arts opens its Exquisite Consequence exhibition, from 6 to 9 p.m. Friday at 25 NE Second St.

The historic Alfred I Dupont building hosts DWNTWN Art Windows at 169 E. Flagler St.

Centro Cultural Español, 1490 Biscayne Blvd., presents photographer Isabel MuÑoz’s La Bestia exhibit from 9 a.m. to 5 p.m. Friday.

At CIFO Art Space, 1018 N. Miami Ave., see Not Me: Subject to Change, the exhibition based on its 2012 grants and commissions program; it runs through Nov. 4. (www.cifo.org.)

• One of the most notable events of the fall is the landmark solo exhibition of work by Rashid Johnson at Miami Art Museum.

The exhibition, which runs from Sept. 7 to Nov. 4, encompasses a decade of photography, sculpture, painting and video by this major contemporary artist whose works figure widely in private Miami collections. His work references African-American icons including W.E.B. Du Sois, Miles Davis and Public Enemy along with everyday objects.

An opening party is slated for 6 to 9 p.m. Thursday at the museum, 101 W. Flagler St. in downtown Miami; it is free for members and $10 for non-members.

On Friday. MAM Associate Curator Diana Nawi will lead a guided tour of the exhibit, Rashid Johnson: Message to Our Folk; at 12:30 p.m. On Sept. 24, MAM and Books & Books will discuss Who’s Afraid of Post-Blackness, by novelist and essayist Tourè, author of the exhibition’s catalog, 6:30 to 8 p.m., 265 Aragon Ave. in Coral Gables.

Information: www.miamiartmuseum.org.

•  The de la Cruz Collection unveils a new installation of works by American artist Christian Holstad and a separate installations of works by American artist Seth Price at the Second Saturday artwalk in the Design District on Sept. 8, 7-10 p.m. 3 NE 41st St.

•  The Bass Museum in Miami Beach opens Unnatural, featuring works by Israeli artists, 7-10 p.m. Saturday. A walk-through tour with the artists will be offered at 8 p.m. $10 for nonmembers. 2100 Collins Ave., Miami Beach; www.bassmuseum.org.

•  Miami Dade College has renamed its gallery system as it seeks to create a permanent museum in downtown Miami showcasing holdings from its permanent collection along with temporary exhibitions of work by global and local artists. Its signature space at the Freedom Tower will now be known as the MDC Museum of Art + Design; its galleries will be called MDC Galleries of Art + Design.