Update for those who are interested.
My son & I had a good time this weekend celebrating his birthday at a amusement park. The rain kept the park numbers down, and thus lines were short enough we could practically walk onto top rides. As neither my son nor I are hugely found of large crowds it made for a better than expected day. We were both happier getting sprinkled on that spending half the time in line.
But the club event at the H.S. last Friday was a bust. This may have partly been due to the rain affecting the setup. My son came home and said that most of the booths didn't even have signs stating their club name, and he didn't have much luck talking with them. Being a bit unsure what to do now. I decided it was best to email the vice-principal asking for not just help, but giving her feedback as the success of the event. Bit nervous about this as I don't like intervening in H.S. when he should do it himself. But I know he would just tell me not to bother, that it isn't very important.