The first event on reyfer's flyer that was listed is a sort of exhibition to be held in the Kyocera Dome in Osaka and the Sunshine City Convention Center in Tokyo that displays various outfits that they've worn over the past 10 years (like concert outfits and PV outfits and such) and a lot of other merchandise. There will also be special videos shown with comments from Morning Musume members and the graduated members.
And the second event is connected to the first one, it is a talk show event. Nakazawa Yuko, Iida Kaori, Abe Natsumi, Yasuda Kei and Ishikawa Rika will be appearing to reminisce about their careers in MoMusu.
I think a better translation of the title of the first event would be "Mo10 - Morning Musume 10th Anniversary Exhibition" because 展 at the end of an event name has the meaning of "exhibition", "gallery", etc.