Aside from being a member of the media, how could you get inside this place FOR FREE?
Stewart Cummings, whoever he is (or was), worked at the Montreal Forum, at least during the 1963-64 season. This was his pass to get in, although it didn’t entitle him to a seat. He also had to pay tax on it.
And if he still worked there in following years, he could have used it to see not only Habs games and practices but also the Beatles, who played the Forum on February 8, 1964, the Rolling Stones in 1965, plus circuses and Ice Capades and wrestling and all kinds of good stuff.