It seems from the link in the OP that Dolly had a very small wedding back in 1966, with only her mother as witness, so I can understand her wanting to do it again, 50 years on, and make a bigger thing of it.
We had a very small register office wedding and although I wouldn't want to go through that bit again, it has been the excuse for some memorable parties at regular intervals ever since 
I've told MrA that I want to celebrate our Golden Wedding in 4 years' time with a return visit to Fat Harold's in North Myrtle Beach, NC www.fatharolds.com 
Dolly is going to donate all the profits from the sale of the photographs from her second wedding to her charity which promotes literacy among disadvantaged children in America, so good on her. 