1234, Main Street
Boston, MA 02123
08 April, 2005
<Recipient Address Goes Here>
As I am sure you know, <name of person having the birthday> is having a birthday. It would mean so much to <him/her> if you would join us for a small celebration in <his/her> honor.
The party will be held at <location> on <date and time> Please RSVP by telephoning <host name> at <phone number>.
I know that <name of person having the birthday> will be absolutely thrilled to have you there. I hope you can make it and I look forward to seeing you then.
encl: <List of enclosed items goes here>