I'm not a singer myself (I just join in the chorus). Is it different when you are singing a traditional song which has been changed over the years or a "written " song with a known author.
If I'm calling a dance I feel free to change it to suit the occasion but acknowledge that I've done so e.g. "there's an Irish version and an American version of this dance, this is my version" (I dont want to annoy anyone who already knows the dance)or I give it a new name - Geoff Todds "Katie Jane", simplified for drunken begginners becomes "Katie Jane's Chicken". I wouldn't change a complicated, modern "Danceer's" dance though, call it or leave it.