On the Shabbos Sheva Brochos (the one after the wedding), is the Chosson a chiyuv to get an Aliya? What if there is a Yohrzait who always gets Maftir on that Shabbos, who has priority?

Mogen Avrohom (282), Biur Halocho (136) and others maintain that the Choson should be given an Aliya on the Shabbos after the wedding, especially if it was on Wednesday and closer to Shabbos. However, there is no obligation to honor him with Maftir, therefore the Yohrzait who always gets Maftir on that Shabbos, has priority