We got an email from the director of the daycare center letting us know. She's not looking for recognition herself, merely letting us know in case we wanted to do something for our child's teachers.
The timing is perfect for me. I am a teacher and will soon be off for the summer. I wanted to do a little "Thank You" for my boys' teachers, since they will not be attending this summer.
I think it's wonderful to have days like this. Yes we should be grateful everyday, but as humans it really helps to have days set aside for recognition (birthdays, Christmas, etc). My boys attend a fabulous daycare and really love their teachers. I want them to know how much my husband and I appreciate all that they do.
ETA: I read NBinMN's comment that no parent had ever acknowledged her, and that stinks. I'm so sorry, because what you do is invaluable!
I have to say, this is the first year my kids have been in daycare and I had never heard of this before. I'm often the last to know things (just not a very observant person in general), but it sounds to me like not enough people are aware of this. I'll definitely be mentioning it to people!