These are the conclusions I have come to:
First vandana will refuse to the wedding
Then Saanjh will bring Arjun back to the mandap
Then she will convince Maya to come down and marry Arjun
She will use her "self respect" and kindness to make both understand
Maya may not come out from the room and the Arjun will say he will commit suicide using the gun if she doesn't marry him
ArYa may get married, but Maya may be upset from the fact that Arjun left her in the mandap
She may marry him but refuse to accept him as a husband, her behavior will change towards Arjun resulting in Arjun repeatedly proving his love for her and trying to win her back
That's why the beyhadh for Arjun will start after the wedding, because then his love test begins
Just my predictions