Would my group have to be there early to get tickets to sit together if we are purchasing tickets in person instead of online? Does Tuesday have a discount for non-members? How do you become a member to get the discount if there is one?

I'd recommend it, bc it's the only local IMAX, but since u do choose specific seats try purchasing online

I agree with Tanya

You should be fine walking in as long as your group is reasonable in number (ie-15 or less ppl)

Would suggest ordering online if you have a group to get seating together. No guarantee if seating if bought in person.