Things change all the time with regards to what gets covered on the trg wkends, for example when i did it we learned about the different parts of the rifle, had a 1.5mile run and done some drill. People who have joined after me have said they did a pft, an introduction to MATTS and learned some regimental history and drill. Your best bet would be to ask your training team at the next opportunity. What unit are you part of anyway?
You'll probably have 2 PT lessons (sat and sun). In them you'll do 1.5 mile run, sit ups and press ups and some other fun stuff. You'll do lots of drill and a rifle lesson or two. You'll have loads of powerpoint presentations like V+S,security,badges of rank,structure etc. This is a rough outline, dont quote me.