It's like anything in life, some people WILL let you know promptly, whether you put a date in or not, some won't. I got lumbered with orginising a present from the class for the teacher, asked for contributions by a particular date (to give me time to buy it and get everyone to sign card) and now that I've done all that I still have people coming up to me wondering if it is too late to contribute.... They also seem to be the same people whose children are late most mornings....I sense a pattern!