i think the point that CVs are trying to make is what adi said "when you feel low, you dont want to be sitting home alone depressed, so go out and enjoy, party!"
so keeping that dialogue in mind, Adi gave her no option but to come to party, because he feels this way pankhuri can divert her mind from the horrible incident that happened.
Yes its not realistic,. but its definitely a better option than seeing her cry alone at home, when you can't change anything that happened.. but i guess CVs should have given some time to recover from this situation.. seems like they are rushing this shivam issue.. :S