Hainan Airlines is now providing a challenge throughout the year. As long as you own any elite airline membership or platinum or above credit cards, you are eligible. I got the offer within 3 working days after submitting a photo of my CUP diamond card.
To achieve silver, you need to fly 7500 status km or 6 segments on Hainan Group in 100 days
To achieve gold, you need to fly 15000 status km or 12 segments on Hainan Group in 100 days