Take your time to read their web, roadmap, newspaper and dev team. You can follow their ANN to keep updates, some project didnt update their thread doesn't mean they drop the project. Also, join both airdrop and bounty should make different, since airdrop is like low pay.
Good suggestion mate, but these steps are applicable for the investors who is looking to invest on ICO pre sale and active sale. If you want to find the good bounty and airdrop first you must check their announcement thread in the forum to find all the details about the new ICO.
Then if there is bounty campaign for that project, first please check who is the manager for the bounty campaign. If the project is gonna manage by the good campaign manager you will get the tokens surely and then they are well analyzing the right project before they join with that team.