Expect from coinmarketcap where i can check about crypto events
Simply you can follow any of crypto news portal which must be an enough resource to keep tracking about major crypto related events worldwide.
If you want to know about upcoming ICO/IEO or airdrop/bounty programs then I guess no exact thing will help you as you must need to follow at least more than 5 different platform. Moreover, it may not remain profitable if you participate in ICO or airdrops.