There are many threads out there on airdrops, still couldn't find information I was looking.
Where do I find upcoming and ongoing airdrops schedule? Is there any sub section available on this forum?
The easiest way for me is to subscribe to this thread:
https://bitcointalk.org/index.php?board=161.0. You can do that by clicking on "notify" button in the upper section. That way you will receive a notification mail for every new thread opened, whether be airdrop or bounty related. If you use gmail it is also fairly easy to setup desktop notifications for every new mail arrival, so you get notified as soon as possible and check the new airdrop out.