The following is a very partial list of some of the organizations, institutions, festivals etc. that are available to you on campus, in Mississauga and environs, as well as in Toronto.
 

UTM / U of T / Sheridan

Arts & Culture on the UTM Campus

Blackwood Gallery
Theatre Erindale
Artistic Resource Team
Department of Visual Studies Student Society

Sheridan, Trafalgar Campus

The Gallery
Guest Artist/Critic Lectures

Get involved in the Arts at U of T

Department of Visual Studies Student Society a.k.a. Devious Minds (UTM)
Hart House Art Committee (St. George, open to all students from all campuses)
Artzone (all campuses)

U of T Galleries

Blackwood Gallery (UTM)
Justina M. Barnicke Gallery (St. George)
University of Toronto Art Centre (St. George)
Doris McCarthy Gallery (UTSC)
 

Local Region

Cultural Venues in Mississauga/Oakville/Brampton

Oakville Galleries (Og2)
Art Gallery of Mississauga
Living Arts Centre
Peel Heritage Complex
 

Toronto

Artist Run Centres (selected)

XPACE (emerging artists)
TPW Gallery (photography and moving image)
InterAccess Electronic Media Arts Centre (new media)
Art Metropole (artist books, printed matter, and multiples)
Mercer Union
For further listings of Artist Run Centres, visit: http://www.arcco.ca/members/

Video Art Archive

V-Tape

Large Public Art Galleries

The Powerplant Gallery
Museum of Contemporary Canadian Art
Art Gallery of Ontario

Independent Cinemas

TIFF Lightbox
Bloor Cinema
Royal Cinema
Revue Cinema
Innis Town Hall

Experimental Film

Early Monthly Segments
Cinecyle
National Film Board Mediatheque

Film Festivals

Toronto International Film Festival
Hot Docs (documentary)
Reel Asian (East and Southeast Asian and diaspora)
Inside Out (LGBT)
Images (experimental, avant garde, non-commercial)
imagineNATIVE (indigenous, multilingual, international)
Rendezvous with Madness (mental health and addiction)
plus about 63 other festivals. Further listings can be found at: http://www.torontofilmfestivals.com/

Museums

Royal Ontario Museum
Gardiner Museum (ceramics)
Textile Museum of Canada (craft and art)