Blessings to you ngureco . . . Depends upon the situation . . . . If it's an announcement-kind of Press Conference that could be made any time over the next 10 days, you send a Press Release first . . . If someone is about to be harmed, you call the police and then the media . . .
Journalists and reporters do not usually agree or not agree to attend . . . They report on what ever is most pressing at that moment . . . If you decide to hold a Press Conference, and send out Press Releases, it is up to the individual Journalist/Reporter to look at everything that is going on at that moment and decide which is most important to cover . . .
On a slow news day you may get a ton of Journalists/Reporters . . . If a candidate just made a big gaffe, or a satellite blows up, or there's an earthquake, etc. you may not get anyone to attend . . .
Also, here in the U.S. Journalists and Reporters are somewhat different ~ Journalists research the facts and background check and it takes time . . . Reporters report what is going on that day at that time . . .
Hope some of that helps . . .
Blessings always, Earth Angel . . .