Wa-`alaykum as-salam wa Rarahmatullah wa Barakatuh
In the Name of Allah, the All-Merciful, the Mercy-giving
All praise is due to Allah. Peace and blessings be upon His Prophet Muhammad.
In principle, the five daily Prayers have to be observed in their respective timings. Allah Almighty says what means “Indeed, the Prayer is [a] prescribed [obligation] for the believers at the [well-known] appointed times“ (An-Nisaa’ 4:103) and “ So woe to all those who pray- [that is,] those who are unmindful about their Prayers.” (Al-Ma`un 107:4-5)
Hence, scholars are in agreement that delaying any Prayer beyond its due time is an enormous sin.
On the other hand, combining Prayers (i.e. Maghrib and `Isha together and Zhuhr and `Asr together) is a license that a Muslim may enjoy only at times of need, as maintained by a group of scholars.
Regarding your journey back to home, if Maghrib time begins before you start the journey, you have to pray Maghrib first. If it begins after you set out the journey and there is a chance to stop somewhere to pray Maghrib, then you have to do so. If there is no chance to stop in your way and you expect to reach your destination after `Isha, then you may intend to combine Maghrib and `Isha after you reach there.
Of course, attending at theaters (or the like events) is not an excuse to combine Prayers. Here we suppose that the event itself is permissible; otherwise, the very attendance becomes impermissible.
Allah Almighty knows best.
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