Hall functions

Q: I recently stopped attending hall functions. I often get questioned as to why I'm not attending, as the functions are completely separate and no haraam is taking place. Please advise.

Beginning of Esha time

Q: I read that Maghrib prayer time ends when the redness in the sky goes away. Also I read that it ends half an hour before Isha Azan. Which one is true? Half an hour before Isha azan I feel the sky becomes darker. Can I still pray Maghrib or should I mention as qadha namaz? As I'm a working woman and gets little late to reach home and can't pray in van.

Travelling with a non-mahram

Q:

1. Is it permissible for a woman to sit in the passenger seat of a car which is being driven by a non mahram man?

2. Is it permissible for a woman to sit behind a non mahram man on a motorbike or bicycle?

3. Is it permissible for a non mahram man and a non mahram woman to sit next to each other?