I'm planning on taking my shia friends out for dinner on 15 shaban. However, they usually do borderline or slightly below borderline hijab and my parents said that if I’m taking them out, I will be responsible for their hijab and will get punished for it. We don’t intend on doing anything haram, just want to have iftar at a restaurant. Will anything related to their hijab be my responsibility?

No you are not responsible for their slight shortcomings in how they wear the Hijab. That’s on them. However, take advantage of this occasion to remind them of Imam Zaman (a) and what he expects from us, and for us to make him happy by fully implementing Islamic Laws.

Also, when you are at the restaurant, try to find a corner that’s away from the eyes of men/boys.