1TAC08 is being used for COVID-19 vaccine runs as I type this. Maybe they were using that TAC02 channel as well.
I can second the TAC 8 being used for COVID vax runs at the moment. However, I don't think that has any relation to the activity on TAC 2.
From what I recall back in the summer, I was mostly hearing McKenzie Meadows specific traffic on TAC 2. Since then I've heard all sorts of traffic related to the Haldimand area. Unfortunately, I can't be of too much use, as I was hearing it so much that I disabled it about a month ago as it was distracting me from more relevant chatter.
Recently it seems I've been hearing a bunch of traffic over Burlington and 1GTR with units on route and leaving Caledonia. I've been tempted to turn it back on, but every time I do they talk so much, it's all I hear.