Pointer to an article by Kathy Macaraeg - Volunteering at our kids' school was always an enlightening experience.
One night at dinner my husband was discussing his plan to visit our daughter's elementary school the next day. He'd be working as a volunteer with a small group of students in the library. She warned him that some of the students in the group caused problems for some of the other volunteers, so my husband told her, "Well you'd better let them know that there's a new sheriff in town!" We still laugh about that conversation. The meeting went pretty well, but afterward he admitted some of those kids were pretty challenging.
Volunteering at school often provided us with unique insights into what our kids were experiencing and learning. We could see for ourselves what we going on, and it didn't always align with the stories they were telling us at the dinner table. Sometimes the two of us shared a volunteer slot which was easier to manage, but there was no getting around the disruption it caused to our work schedules. Still, we knew we were lucky to have jobs that enabled us to do it at all.
Some working parents don't have jobs that provide that kind of flexibility, so they may find this article helpful and encouraging. It offers suggestions for parents who aren't able to take a break in the middle of the day: How To Be Involved At School When You're A Working Parent.