Testimonials and endorsements. When celebrities, opinion leaders or respected business leaders give their backing to an event this can generate further support. Having political or trade leaders give a talk at a convention or exhibition can interest more delegates to attend. VIPs attending receptions can attract more participation and media presence . Celebrities often require a fee to endorse or appear at an event, although with community or charity events this may not be the case. Endorsements or notifications of potential VIP attendees can be included in press releases and promotional massage.