This event usually happens one week after the official Yi Peng ceremony and it's only accessible for people who have paid for a ticket in advance. The idea for this is that there will be no crowd and everyone will be comfortable. It is run by he DMC who are buddhist organization who put on large scale events. This even is not an official part of the governments Yi Peng events.
Tickets cost USD$100 and include: 1 set of Lanna-style food (1 snack box and 1 meal box) , 2 Dhammachai floating lanterns, 1 Krathong's (flower vessel for float in canal), 1 souvenir sets, round-trip shuttle bus from meeting point.
Tickets and information can be found at http://www.yeepenglanna.com