There is an open sale for the tickets for the digi festa every year, but it´s nearly impossible to get them that way as the Website breaks down because of too much traffic everytime. The venue 2015 was pretty small and not very fancy, it looked more like a warehouse, but hey, it was located in Odaiba/Toyosu, so kind of nostalic for Digimon fans. Half of the show was product advertising, mostly because it was before the first tri movie aired and they didn´t have many things to show. The festa last year was at a much bigger event space. You could line up for the goods even without tickets for the show, if I remember it correctly it took us around 4 hours there to get the merchandise, and we were in the very front of the queue... The Event itself was much better than the year before, we all cried during the emotional farewell letter of Piyomons Seiyuu for Soras former Seiyuu, and of course during Aims Memorial Medley with Wada Kôjis playback. And of course the mini Drama stage Performance of the Seiyuus *-* It really sucks that they are making it even more complicated to get the tickets this year by putting the participation code for the lottery into the bluray of the 4th Movie...