Invite everyone you know in a certain city to a farewell party. (I'm not sure whether you actually have to be leaving town to do this or not.) The ones who cannot attend will write lovely notes to you telling you how much you mean to them and how much they will miss you. They will not necessarily mean what they say, but they will make you feel great. (I'm not sure how often you can do this in one calendar year--at least once, I am sure.)
(For more information, see my Moving To Toronto blog)