We flew home on Valentine's Day and SWA called it a holiday and drinks were free. We are next flying on St. Patrick's Day to AZ and they now call that a holiday. Not complaining. It's just funny. It used to be just the 6 major US holidays. 

Missing Christmas and maybe? Labor Day, but I didn't know the list was that long.Might be missing a few, but:
- New Year's Day
- Valentine's Day
- St. Patrick's Day
- Mother's Day
- June 18th: Southwest's Birthday
- Father's Day
- Fourth of July
- Halloween
- Thanksgiving
Missing Christmas and maybe? Labor Day, but I didn't know the list was that long.
Yea, on our way to Vegas last month, two drinks each and no coupons collected. But, it all depends on the FA. We have had some persnickety FA and every thing must be collected.The last time I flew on SWA in October I ordered two drinks and gave them coupons that expired in June. The man said, "I can see if they are four days expired, but four months?" and laughed. I looked at my other two. Also expired with same date. He said, "Give me your coupons and these first two are on me." I surrendered all coupons and received my drinks. Soon I ordered another round. As he brought them I held out my credit card and he just waved me off. I love SWA.