Gifted DLC pack when I don't own the base game, what happens?

Don't enter his giveaway. Why would you?

Is there a reason you feel the need to deprive someone who can actually use the DLC from winning it?

They made it so you can't redeem DLC you don't own the game for some time ago. The gifter could possibly agree to send it to your Steam inventory, but most likely they'll ask cg to reroll the giveaway instead (I would). The site is supposed to check and prevent you from entering if you don't have the base game, but sometimes it doesn't seem to work. Please consider leaving the DLC for someone who can actually use it.

I reworded my question, maybe I'll get a answer. Just wondering, what would happen to the DLC should someone gift a person the DLC when they don't own the base game. Does it just sit in arriving gifts, or does it get placed in your account but unusable/redeemable, or does it get sent back to the gifter? What happens?

The OP is asking what happens when someone gifts him/her something, which implies direct gifting and is not directly related to entering a giveaway and winning then receiving the gift- I cannot understand why everyone is assuming she is entering (or has entered) a giveaway for a DLC without owning the base game

As far as I heard, DLC from rewarded from summercamp tickets are non giftable or tradeable. SG doesn't allow entry to DLC giveaways without the base game.