Since there are very few kalyana mandapams in Delhi, booking it six months in advance is preferable as the south Indian marriages take place on an auspicious day at particular times called ‘muhurtham,’ which is the most important aspect of the wedding, where, if the time id delayed then the whole wedding can be canceled. Hence you must take extra care of these aspects, as all families that are planning a wedding at a kalyana mandapams will want to book the venue for the muhurtham. Hence booking at least six months in advance would reduce the possibilities of last-minute issues.