I'm not sure if this was covered or not. Last year as we were going through first grade (our DS was 5 1/2 at that time--so the same age range) we found it very frustrating to get information from him on what went on during the day. The school didn't send us a whole lot of information and every time we asked him about it, it was "I don't know..." Seeing these posts reminds me of those days...

Someone gave me a tip about midway through the year: ask at bedtime. I found that if, after book, and after tuck-in, after all of that, when we turned off the lights if I asked him about his day, he'd tell me quite a bit more about it. It was very interesting, as this almost always works. DS is a bit more talkative about his day now (he actually enjoys telling us the highs and lows of the day) but we still talk about our days right at bedtime. I'll tell him a little bit about my day and then he'll tell me all about his.

Hope that helps.

JB