It will be re-opened very soon (maybe today, tomorrow) as the new rules should apply from the next week's airdrop as @Deeper stated.
So stay tuned and check both forums regularly to know more.
But you have to have at least 100 Onions in your wallet in order to participate in the airdrop so you can buy them on Novaexchange or simply be active
on DO forum and pariticipate in one of many contests, giveaways, bounties.