#club5050 is a campaign to support the Steem cryptocurrency.
This means to participate in #club5050 you must balance any cash-outs or transfers away with equal or greater power-ups over one calendar month.
To understand more about this campaign, pls visit Steemblog where @steemcurator01 explained this briefly.
I hope this helped you. I advise you to do the same when you get curated so power up at least 50% of the rewards to be eligible for this #club5050.