Yes and plenty of those parents will have taken time off because if other parents are going they don’t want their kids to feel sad that their own parents haven’t shown.
I once volunteered a couple of times when dd was I. Primary. Once was to paint a wall with our kids. That was fine. Another was the general volunteer group. They, including the head teacher, were very clique like. It was horrendous. Several parents joined and leftOne because her husband was. A landscape gardener and they kept pushing her to get him to do a huge project for free. He offered to help in his spare time if the school bought materials, but they didn’t want to spend the money on materials and felt him working there and not earning money was ‘the least he could do’. Their expectations were wildly off.
Fairs etc were were a complete pain in the arse tbh. I get the parents at your school like the idea, but in practice. Most people don’t.
Summer is also a bit of a nightmare. Time off for sports days, end of year assemblies etc.
I get yours was a weekend. But still, weekends are busy with kids hobbies, catching up on the families social life, getting caught up with housework, homework etc I don’t want to spend my time at the fair. Spending money on a Tombola to win a bottle of ketchup. The kids never wanted to go to school on a weekend after been there all week.
I think people get obligation fatigue with schools. Between school trips, non uniform, book days, parents assemblies, school shows, daily homework, make a Christmas jumper, make a video of a weekend in your family and the rest, I think a lot of people simply don’t want to be in a position where they are taking on more obligation. Especially if they work.
My youngest has is in high school and it’s a huge sigh of relief that there’s no longer the long list of o ligations for me to meet.
if people moan they want a fair to you simply reply there’s not enough people volunteering and they are welcome to give it a go.