Already released merchandises of Keroro Gunsou and BB Senshi Sangokuden were available at the event, and customers were eligible to get the limited bookmarks from the event. All 10 designs, and because the number given out was limited, those who came late to the event didn't get them at all.
Illustrations from "SD Gundam Sangokuden Brave Battle Warriors" were shown, and the actual model of BB Senshi Ryubi Gundam from the new Shin series was on display as well. There was guest appearance of Ryubi Gundam and Keroro Gunsou to shake hands with visitors as well.
Three days before this commemorative fair, the preview for both movies was held in Tokyo.
Shin Ryubi Gundam and Shin Koshin Gyan were on display. Both are scheduled to be released on February 25th at 630 Yen (inclusive of tax).
Keroro Gunsou's movie, "Keroro Gunso the Super Movie: Creation! Ultimate Keroro, Wonder Space-Time Island" and "SD Gundam Sangokuden Brave Battle Warriors" will premiere together in Japan on February 27th.
Images and information are from Gundam Dot Info: Link 1, Link 2.