Hello @heartbeat1515 It is a community initiative that carried over from the Steem blockchain. It is free, it takes place the 1st of each month, and for those that qualify, there are some potential prizes. https://peakd.com/hive/@streetstyle/hive-power-up-day-april-1st-2020-out-of-the-hive-and-into-the-swarm-hive-blockchain-community

Link above has some info on the rules and details. Let me know if you still have any questions. Thanks and take care.