Hi Tinkerbell.....
Go to the Drury site and click on Reservation, then New Reservation. Put in your dates, city, etc. On the right side, you'll see a drop-down box that says "Rate". Click on that and you'll see an option that says "Promotional Rate". Once you select this you'll see a blank field to put in your coupon/promo code.
The ones I have used in the past are "STLFUN", "FUN" and right now there's one called "SUPER".
You have to kind of experiment and look at ALL the different price differences, compare to their weekend and web specials and/or
AAA pricing (if you have a AAA membership).
When I was looking at the weekend of August 7-8, it looked like the rate for Sunday night was higher than Saturday. I'm not sure why that is.
You guys will have a wonderful time! Great place.