To post jobs at a trade show or job fair, you must first participate in the event as an exhibitor by registering with the event organizer and submitting your company details, job descriptions, and application forms. After registration, promote your participation on social media, your company’s website, and through email campaigns, providing clear registration links for potential candidates. Prepare your company profile and booth materials in advance and plan a strategy for collecting resumes and following up with candidates after the event.