Here's what rhymes with ceremonial.

Consider these alternatives

ritual / residual ceremony / testimony parades / states festivities / activities processions / presence coronation / relation customary / very ornate / late parade / made attire / fire dignitaries / varies occasions / relations inauguration / operation celebrations / relations funerary / very garb / part rites / rights occasion / education sword / called celebratory / story solemn / column celebration / operation formal / normal swords / towards worn / form banquet / language ritualistic / characteristic