I do them, once a month (although in the summer I tend to get lazy and forget). In them I include any welcomes and goodbyes that are happening that month, any birthdays or upcoming events. I include any closures for that month and also upcoming months (this way nobody can say they didn't know I would be closing). I put in our themes for that month, any reminders (such as warm clothes, change of clothes, stuff like that). I include what letters and numbers we are doing, what colours/shapes etc. I also include a book list and a few songs that we will be learning (hopefully the parents will also sing them to the kids to be a part of their daycare life). There is probably more that I'm forgetting but that is the general gist of what I do.