How can you make a great impression, when hundreds of other candidates are at the same event? It helps to put in a bit of extra thought beforehand, writes Fortune’s Anne Fisher in her Oct. 10 Ask Annie column. Have you ever gotten a job offer after meeting a corporate recruiter at a job fair? What worked (or didn’t) for you? If you are a recruiter, what advice do you have to help job-fair attendees stand out from the crowd?