Have a motto for each day. If after school, parents could be invited and older siblings to come too. Magic, Dr. Seuss, women, a beach party, reach for the stars, fairy tales, the wizard of Oz., etc. Classes having library time that day could have an additional book read to them during that time. Have guest speakers come in and share their favorite childhood stories and discuss the importance of lifelong library use.
Guests can include town supervisor, mayor, school board members, principal, etc.