The COC, TSO and National Ballet put on a number of pay-what-you-can ( just walk in! ) performances, at Harbourfront in the Summer for instance.
The TSO has a series of concerts for children at RTH on Saturday afternoons and a program allowing high school music students to attend rehearsals of the orchestra. And of course there's the TSO Youth Orchestra which tours across Canada and abroad. The Adopt a Player program allows TSO musicians to visit schools in the GTA ( the last time I saw the Bach Consort - which is composed of TSO players who donate their time for free - it was as a fundraiser for Adopt a Player). Preludes is a similar program, which visits students at school. Masterclasses are offered for high school orchestras and bands. Though not as ambitious as what the COC does, the TSO also occasionally holds free lunchtime concerts at RTH.
The COC has run a school tour program for over 20 years, performing operas written for children and running workshops in schools. They also run a school program to visit dress rehearsals, and hold workshops, at the opera house.