program of a ceremony; order of ceremony
Refers to the printed or announced schedule of events for a formal ceremony, such as a wedding, graduation, or awards ceremony.
The program for the wedding ceremony was distributed.
The diploma presentation was conducted according to the ceremony program.
次第 alone can mean 'order' or 'circumstances', but 式次第 is a fixed compound meaning 'ceremony program'.
Compound of 式 (ceremony) and 次第 (order, program).