I am mouth-watering the garland of college friends to go out to cooking with me for my birthday. we wish them to compensate for their dishes as well as we don't design any presents. we don't know how to write the email to entice them? Should we spirit upon payment/no present? If so, how can we hint? Or is it the enlightenment between college students which they would compensate for themselves as well as they will not design me to compensate for them?