Shinko-sai Festival' means an 'imperial visit by god' and broadly refers to the entire imperial visit; narrowly conceived it refers to the process of the outward trip from the shrine to the destination such as otabisho.
神幸祭は「神の行幸」の意味で、広義には行幸の全体を、狭義には神社から御旅所などの目的地までの往路の過程を指す。