If your company has decided to hold a press conference a first step is to contact medias. This is done with announcement letter of press conference. The announcement letter should be sent to the targeted assignment editors at television stations, news directors at radio stations, and at major newspapers, but also to the reporters you have worked with before, contacts in the media you may have, and reporters who may have covered the issue in recent months. Your company may already have a type of mailing list with most important media contracts. If you don't have one, you may consider involving a PR company who will facilitate invitation process. Press conference announcement letter should indicate exact date, time and venue of