Might depend on houses, aspects, personal tastes, and a hundred other factors (and it's all the more amusing if a DB marries a patrician, for example).<br/><br/>You can make up whatever you want, really.  I assume that an Immaculate would have to officiate, but the details of the ceremony are probably set up by the happy couple (assuming they're happy about any of this) and whatever family members organized the wedding.