is this going to kids or adults?? if you are always Ms Lasinsky to them I would first & last name so they know who you are - if everyone knows you as your first name I would go with jusst that (more friendly to me)
case in point - there was a college student helping out in a class when her time was up she gave the kids a little bag (pencil type stuff) but the parents ask who is Mary, I didn't see a Mary on the student list - a few even sent Mary a V-day card & didn't know who she was but didn't want to leave any kid out