celebrant

noun3

1. •
   A person who officiates at a religious ceremony, especially a marriage or the Eucharist.
2. •
   (Australia, New-Zealand) A person who conducts formal ceremonies in the community, particularly weddings, baby namings, renewals of wedding vows and funerals.

   • These are celebrants who marry people at registry offices. — 1983
3. •
   A person who is celebrating something.

   • Once inside, about all that the celebrants could do was nod their heads to the music and pat their feet. — 1977