I did voluntary work with my former parish church in London. I was editing the newsletter which involved researching, writing and commissioning articles, in addition to the proofreading, copy editing, sorting the layoyt, and bringing to print and brought to the distributor, and I was also on the "Meet and Greet Committee", and also organizing events. All this I could usually fit around work, but I found that although they did show appreciation for my hard work, there were no offers of helping me look after my children for a bit when close to deadline and really hectic. From all the elderly ladies, not one offered to come and sit with my children, even if they knew I had childcare problems. My husband was often away for months at the time, and especially in the run up to Christmas, which was the most important deadline for the newsletter, and also my most hectic time in work.
I had to give it up. I could not afford to pay babysitters to come and spend an hour now and then with my children.
I have held both parent governor roles, and pta roles, in school and preschool in Norway, and found both really unrewarding. Lots of hours spent, not a thanks. The headmistress of my sons old school kept offloading tasks to me, which really was the duty of the admin assistant, and not a PTA member.
The worst experience though, was when I was on the Church council, different parish, different people, and also took on writing articles for the Parish Newsletter, which was a really big publication. Often I had to attend events, such as concerts, and write reviews, take pictures, or sometimes interview people in new positions in the Church, to introduce them to the parish. I would send all this work off to the editor, he did not even acknowledge my emails! Not even ONE "thank you, this is great".
I baked for the Christmas party, other events and celebrations, I helped organize the Christmas Fayre, cleaned up when the guests had gone, several hours in the middle of Christmas, I had church warden duties several times per year. And nobody ever said "thanks, great that you could come and help". Or, "here take some left over cake home for your family". Nothing. When the annual "Volunteers thank you party" was held, I did not get an invite.
So, in general:
If you are working with volunteers, please keep in mind that they give up valuable time, time that could be used earning money, or having quality time with their families. The least you can do is say "thank you", respond to emails, or even smile and acknowledge them. This is the very least.