Bachelor Party in Montreal during F1

Hi everyone,

I recently got engaged and I plan on going to Montreal during F1 for my bachelor party with ~12-13 of my closest friends.

I'm essentially curious about the following:

1) I went to watch F1 in Spain a couple years ago. This won't be my first F1 trip. Is it worth it to get seats for practice/qualifying/racing again? Or would general admission on Sunday be fun times enough? I'm attempting to keep the trip as affordable as possible for everyone.

2) What's there to do during the day in Montreal (if we don't end up getting the 3 days pass to the race)?

Any other general tips and suggestions would be great thank you!