This is an ages old way to fix wedding dates. All the elders of the family and friends and other respectable people from the area gather, join the family in the decision, and pray for the success of the decision and give their blessings. Men, then, one by one tie a knot each on a 'string' presented to them. After the knots are tied, all the guests congratulate both the families. Everyone is then presented a traditional sweet (mithai), which is followed by a feast. Women sing songs all night, a tradition called 'Jaaga' literally 'staying awake,' which is still an important part of weddings, engagements, child births and other such occasions in rural
The knots are later sent, one each, to everyone you want to invite on wedding, by hand. The person who delivers the knots informs the receivers wedding date as well. This is how it happened till some thirty, or may be even lesser, years back.
This was my first ever experience to attend a 'Gadh,' a tradition that is fading really quickly, and my guess is that would be redundant in few years. I wonder why these traditions aren’t important or practical enough for people anymore. I'm glad I got to be part of it, at least once, in my life.