1) Ceremoniously 2) In a ceremonial manner 3) In a ceremonious manner 1) Ceremoniously 2) Ritually 
• (adv.) According to rites and ceremonies; as, a person ceremonially unclean.
Cer`e·mo'ni·al·ly adverb According to rites and ceremonies; as, a person ceremonially unclean. 
[adv] - in a ceremonial manner
ritually adverb in a ceremonial manner; `he was ceremonially sworn in as President`