Our guild does one every year. Usually, there are too many shops to visit in one day, so the following day a few of us will get together and visit the rest ourselves. We always have a great time
It's amazing the variety of fabrics that are available. It's nice to see what other shops offer or specialize in, as well as to get a feel for the different shops themselves. If they are two hours or less away, you may find a new shop you love - or a place that offers classes you don't have closer.
I say go for it! Chances of winning a prize are probably small - hundreds of people usually participate - but it's still a lot of fun.