I am thinking of asking the choir of the school where I am a teacher to sing a piece at my ceremony. Obviously I will make a donation to the school or whatever else the principal would like me to do as payment. However, I'm not sure what the etiquette is regarding inviting them to the reception. Should I invite them, even if they will not be performing during the reception, only at the ceremony? Does it make a difference that they know me, since they are my students? For clarity, I am a teacher but I am NOT the choir director.