Have your students write a letter to the students in the next grade they will be entering. Tell them to write a letter telling the new students what their current grade is going to be like. Tell them about something that was new this year. Tell them something that stayed the same. Explain the rules and expectations of a first grader.
You can also have your students write to the grade above them asking what that grade will be like.
1st through 5th grade can write letters to the grade level before them.
1st through 4th grade can write letters to their new grade level asking what the grade above them will be like.