Happy hour is a marketing term for a time when venue (such as a restaurant, bar, bowling alley, stadium, state fair, or county fair) offers discounts on alcoholic drinks. Free appetizers and discounted menu items are often served during happy hour.
 
We were all invited by our German design to a ice cream shop for our happy hour on Monday. It was great and we all enjoyed it. 
BTW, the ice cream is tasty.