2 states - Marriage procession with bride & groom from different cultures but within same religion.

I wonder how bride & groom from different states with different culture but within same religion manage to succeed their marriage procession. Where one family has followed a single day marriage and on the other hand the other family has followed 2-3 days marriage.

Do the families play an important role in managing all the chores? Or do they simply ask an event management team to take care of the planning and execution.

Also I’m aware the families can have conflicts between them because obviously there will be slight/more difference in the rituals. But isn’t there any way to avoid those clashes?

Ofcourse bride and groom won’t be giving any script to their families of how to behave, what to do and what not to. But is there really any way of atleast minimizing the risk of such conflicts.

Note: I’m already married and I’m asking this just because I’m curious about it 😛