This means the event is not a guaranteed thing, but a high probability match.
Supporters will be able to receive free native token of zkSync once it launches in the near future.
To be eligible, you need to actually participate in the network, please find a few things you can do in our article zkSync Airdrop.
I will not believe any other source the force the participant to download the wallet, that has a very high possibility to be a scam website. Zksync was a protocol and downloading wallet from unknown party is a very high risk decision by anyone who wanna participate in the airdrop. It's a scam.