when can I use scan and go at Sam's club rogers ar?

That is currently available, if you don't see a scanner, ask at Customer Service.

Only on the 2nd Tuesday of the week

Anytime inside the store. The store should be opened and you should be inside the store while you scan the items.

Any time

Almost all times. You can have a e-receipt that you can look back for returns or reference

Anytime they are open