Donald J Trump or Melania Trump to participate in your event” are instructed to fill in an online form, answering questions such as “Will Media be Present?” and whether any “Notable Attendees” are expected.It is common for former presidents and major public figures to sign up with professional agencies bureaus public speakers - however, Trump's move is different.
The 45office website is not a third party company, meaning Trump has full reign over his image and all the profits he can make from it.
The website celebsbar.com is an aggregator of news from open sources. The source is indicated at the beginning and at the end of the announcement. You can send a complaint on the news if you find it unreliable.