Byteball will make the next airdrop on august 7, in 14 days from now. The airdrop entitles every Byteball holder with an additional 0.2 Byteball. At the previous airdrops July 9, the price increased to almost 0.35 BTC just before the airdrop (I thought it was even higher, but according to the below graph it's 0.35) and then decreased quickly to 0.25 directly after the airdrop. The current price is 0.197 BTC and I find it likely that the price will increase at least 50% in the next two weeks. At least, you can increase your holdings by 20%!
To be entitled for the airdrop, you need to download the Byteball wallet from https://byteball.org