As of the Spring of 2003, it is called Activity Day Program and no longer Achievement Days. Many people haven't had the proper instruction as to what it should be called. A conflict also arises when there is another Quarterly Activity Day where the entire Primary is invited to an activity outside the normal Primary hours on Sunday. The naming gets a little
confusing.

See Sister Menlove's talk at the Primary Open House in March (printed in April) regarding the change:  http://www.lds.org/library/display/0,4945,4160-1-2154-1,00.html