Dear …
On behalf of __(name of organization)__, thank you for attending the __(type of)__ Career Fair on __(date)__. We hope that you found it to be informative and helpful in your job search. These Career Fairs are offered to attract people like you, who are looking for a specific career opportunity and employers who have those specific positions available. Finding good matches, for both candidates and the employers, through these Career Fairs, has proven to be quite successful.
A career in the __(type of field)__ can be very rewarding and we were pleased to have the chance to showcase to you some of the opportunities that are currently available. If you have not found the position you are looking for quite yet, we encourage you to keep in touch with us so that we may keep you posted on upcoming Career Fairs.
Once again, thank you joining us at the __(type of)__ Career Fair. We were delighted that you were able to attend.
Best regards,