Bollywood got a wide variety of stories that set on backdrop of Marriage functions. Here is a look at those movies.
Band Baaja Baaraat

The story goes like this.
Bittu Sharma (Ranvir Singh) meets Shruti Kakkar in a function and decides to carry their friendship forward. Shruti shares his dream of opening a wedding planning company to bittu.after the initial blocks they set up their business named ‘Shaadi Mubarak’. They start with a low budget project and after the success they plan many lower budget weddings. The story comes to a twist when Bittoo leaves ‘Shaadi Mubarak’ to create his own company.
Monsoon Wedding

Bride and Prejudice

Dilwale Dulhania Le Jayenge

If you interested, you can watch Complete list of Bollywood wedding dance songs for party.