lol---Ladies you can wait for few days, cant you :p
Guy can also wait for few days if bride happens to hit her day on Suhag raat or even going through tha ..
traditionaly, larki waley pick the date just for that reason as they know larki ki dates .
but now, cause other things also need to be considered (as Ira mentioned) like weekend, or marriage hall availibility and the fact that now dates are scheduled so much in advance that you cannot be certain for sure.
no where , it is required to consummate marriage on wedding night anyway ..