L.M.
Get a bin and only put the things you ABSOLUTELY want to save.
Get a bulletin board and hang it up where it's easy to access. Put important notices on it and favored art work to display.
Keep it updated weekly.
Keep a family calendar and write down things like half days and family fun night and art expo night etc etc.
Be part of the PTA if for no other reason than to stay in the loop on school happenings that you may otherwise not fully know are going on.
Find out who the class mom is and make sure you're on her email list and whatnot so you stay informed.
Enjoy!