http://go.maggianos.com/reheat it gives you the instructions for your preference

If you join the email list, they send coupons pretty often.

I have seen folks in tux and formal dress and others in jeans and t-shirt at the same night

I am pretty sure that they do

Yes they do. I had my rehearsal dinner there

Yes, it just has to be store bought or purchased from a bakery. They don't allow homemade cakes

You should call and ask

Depends on what you order

Online would be the best place to look and calling the restaurant is another option.