I'm going to pretend to not be sick so I could go to my cousin's birthday party
Why would you pretend to not be sick?
I really want to go there.
You should not lie to family. Don't go to gathering if you are sick or have a cold.
I'm hiding my allergies and fevers.
You should pretend you are not sick if you have a fever. You may be contagious and could end up getting everyone there sick.