Our Marketing department is wanting to do a Facebook post for Thanksgiving for people to come into a specific branch, tell the teller what you are thankful for, and be entered into a drawing for a $20 gift card. Would this be considered a lottery and would we need specific "contest" rules?

Why bother - who in this COVID environment is going to risk going into a bank branch for a chance at $20 and end up on a ventilator?

This particular bank is inside a grocery store, so there is a lot of traffic...

Then, have you read the Texas Business and Commerce Code Title 13 Section 621