式年遷宮祭
しきねんせんぐうさい
fixed-interval transfer ceremony (wherein a shrine's sacred object is transferred to a newly constructed main hall)
式年遷宮 is read as しきねんせんぐう (shikinensenguu) and means construction of a new shrine and transfer of the enshrined object from the old to the new, occurring at a regular, preordained time.
しきねんせんぐう
shikinensenguu