I'm feeling a bit sorry for myself. 
After a member of staff went on long term sick at my DS's school I stepped in to run the afterschool club so that the children could continue with it. The club finished before half term and I started covering in November last year.
We have just had the first school awards assembly since I finished helping and no-one, not a single member of staff said 'thank you' to me for covering the club.
No-one even batted an eyelid on my last day helping them despite several acknowledging it was my last session. 
Surely when parents take time out of their day to help at a school a simple 'thanks' would be nice or AIBU ?