100 Acts of Kindness
My school does this activity beginning with Martin Luther King, Jr. Day and ending with Valentine's Day. The idea is that each class keeps track of the acts of kindness they observe. The goal is to record 100 acts. (The 100th Day of school is around this time in our district so there is another connection.)
I know there are several versions of this activity. Here is the link to the free printable forms I use in my classroom.