There are multiple artists with this name:
1) Ceremony is a hardcore punk band from the San Francisco Bay Area that formed in 2005.
2) Ceremony is a Post-Punk/Shoegaze band from Fredericksburg, Virginia, featuring two members of Skywave. Their next release is slated to be released in Mid April.
3) Ceremony is a rock band based in Australia with a worldwide release of their debut album available early 2008.