We started it last year as a fun activity to do during testing. For that one, we did a bunch of measuring & geometry exercises. They build polygons with spaghetti & marshmallows. They measured circumference of cake circles with yarn, they found the perimeter & area of the cafeteria. It was such a success, we decided to do it monthly this year.
Our first one was all operations. Many of the activities came from Mailbox. We have groups of 3rd -4th, and then 5th-6th to keep the math on level for them. At that point, 3rd was not yet doing multiplication, so those stations did addition/subtraction instead. In November it was "the price is right" and all the activities dealt with money. They shopped magazines with a budget, ordered grocery items least to greatest, tallied Scholastic orders, shopped for items in a recipe...In December we did a cooking lab. They made cinnamon-glue ornaments, bags of hot cocoa, and a shortcake (using the book & recipe from Cook-a-doodle-doo). For the older kids, they had to use equivalent fractions becuase I wouldn't give them the "right" measuring cups.
Today was a cruise theme, not all math, and we were all decked out in floral shirts & sunglasses. They had to weigh food at the buffet table- they could only get 10 oz of food (we had the kids bring in tropical fruits). They made island landforms with playdough, decorated & addressed postcards....
We are blessed in that we have a group of older students to man the stations. Once everything is set up, the teachers can just stand back and watch.