When new Airdrop ? How to suscribe to the new Airdrop ? See the first airdrop is finished

We don't have any new Airdop scheduled at the moment. But we want to reward the ETHX holder and find a way to encourage them to hold their ETHX.
So it's an automated Airdrop ? How much token & time we need to have the airdrop ?
Nothing official yet but we are working on it. Some other projects use this kind of system. (ex. OmiseGo) We find it a good way for a coin to avoid that dumps