Reference - Gur Panth Prakash - vol 2 - by Giani Gian Singh
Page 1100 - first marriage of Dasam Patshah
bedi bed bidhi yut bar bad
bisukarma suth that thaye
Page1303 - second marriage of Dasam Patshah
saha turteh layeo sudhaee
sabhai samagri tyar karaee
reet bed kul kar sabh bhai
satgur kau fere karvai.
According to the accounts above, 'BED BIDHI' was the vidhee (ritual) used in marriages of Guru Gobind Singh.
Per Namdhari tradition, the Anand of Guru Ram Singh and Guru Hari Singh were also performed with the Vedic ritual.
From my own research, even though the Nirankari claim to be the first to circumbate the Granth Sahib (Probably Aad Sri Granth Sahib and not Dasam Sri Granth Sahib), there is no record that they used the Laava (and not Anand Sahib) or how many times they circumbate the Granth Sahib when their Maryada first began. Also it is surprising that there was obviously no ruckus made by the Brahmins against the Nirankaris for creating their own Anand Maryada because when the Namdharis did so, they filed cases and threatened to throw themselves into fire and let the 'sin of killing a brahmin' fall on Namdharis, lol!
Giani Gian Singh also credits Namdharis, Guru Ram Singh in particular, as the one to introduce Anand marriage. Interestingly, however, Bhai Kahn Singh's article on Baba Ajapal Singh, who Namdharis assume to be Guru Gobind Singh per Baba Saroop Singh's narration, performed 2 Anand Karaj (that Baba Saroop Singh knew of) by reciting Anand Sahib after perorming Ardas, no circumbating around anything! Ignoring the fact whether you consider Baba Ajapal Singh to be Baba Ajapal Singh or Guru Gobind Singh, an Anand Karaj was definitely performed in a NON-VEDIC manner, possibly for the first time in recorded Sikh history!
This is an interesting topic and I wish people will share more facts rather than 'my chacha said so and so'.