We've had a few here in BC. You get a passport at the 1st shop.... & have it stamped. Buy a basic block for $5 and move on..... The 1st one we went to DH drove us... let us off at the door & we ran in, got in the line up, did our stamp....got our blocks & left..... The last one I went to we only did 4/10 of the shops....but found some fabrics we liked....& had a great day...didn't win anything because you had to visit all 10 of the shops to qualify. I think any time you get an opportunity to do something FUN.... go for it.... forget about whether there is a prize or not.
Have you ever done the on-line one? You get a "free pattern" as your prize.... nothing exciting, especially if you have EQ.