I'm not sure why this is directed to stay at home moms. Can't working mom's pick something up at the grocery store or something? I'm not even sure how this is relevent to staying home or not?
At the school where my DS attended 6th grade the parental participation was low. I was the room mom and it was pretty much a one woman show. I never really minded because I looked at like I was doing it for the kids. It does seem frustrating but just keep in mind it's for the kids. Some of the kids didn't have a whole lot or a great home life so I felt like I might be able to bring a bit of joy into thier day- maybe even life. I was always cheerful and joked around with them and really made the parties fun so they would feel good about their school. Just try not to get bogged down with the other issues.
Good luck with the Valentine's day party!

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I guess the point is, maybe, a person who isn't working outside the home might possibly be available to volunteer for doing something inside the classroom. I work fulltime outside the home as a family physician. Today was my day off from work. All of the doctors get a day off, and Thursday is mine. This afternoon, I worked at the book sale. Tomorrow night, I have Blue and Gold dinner, for which my husband and I were co-chairmen for the cub scout pack. I cannot volunteer to be room mom, because that might require coming in some day between 7:30 am and 5:30 pm on a weekday other than Thursday, but I try to do whatever time and finances allow. I feel guilty that I don't have the flexibility in my work situation to do things like cook for the Chili supper, or go to the PTA meetings, which are on my night on-call (Tuesday). I kind of understand the statement, but, I am always trying to find ways that I might be able to contribute more to the school.