Since these Airdrops are for EOS holders and the primary requirement to get these free Airdrop tokens/coins is to hold your EOS tokens in the MEA (My ether wallet)
Just for future reference the acronym used for "My Ether Wallet" is MEW.
you must have to transfer your EOS coins to the wallets and registered them to the ethereum address before within 23 hours after the end of the final period on June 1, 2018 at 22:59:59 UTC.
What do you mean before and after?
RE: 3 Most Important Airdrops for EOS holders