There are as many as 47 University-level committees, to which there are 118 undergraduate student representatives. McGill University is huge, and most of the groundwork for new initiatives on campus begins in such committees.
Starting in Fall 2015, SSMU University Affairs started mandating student reps in these committees to submit reports for dissemination. In Fall 2016, the committees worked on many issues that are pertinent to the campus community, and their report can be seen here