The reference pertains to school activities. Students can purchase "activity cards" that allow them to attend school functions such as basketball games and other sporting events at school. Students who buy an annual activity card can also attend other events at school such as dramatic plays, cooking events such as barbeques, and so forth. The school charges a reasonable fee, usually for the year. The students benefit from the school activities and the school and/or particular department at school, raise some funding to help with costs.

well, a high school drama teacher needs money to go on play program. so she consider funding though activity card

I've never heard of those. Can you tell us more about where you heard that term? A little more information would help.