Primary children put on badge during sharing time and class time. If they have their badge by the end of the two hours then they get a small treat at the end (if they lose their badge they can get it back by being reverent and showing good choices).
"Think Five" A great way to help remind the children what is expected of them during primary to help with reverence and feeling the spirit. The link no longer works, but here are the 5 things to remember.
2017 LDS Sharing Time Ideas for July Week 3: Reverence is deep respect and love toward God.