Yellow journalism is when journalists share facts that had been twisted. They lied to capture the publics attention which would mostly cause people to act upon what they heard. So if they heard Cuba was in deep poverty and are dying quickly but in reality there food supply is down, people would still want to help them. But in other cases it has cause war and made people very skeptical about trust news all together.
The author is giving details and purpose to this event and is inviting people to come to attend it. They even tell you how you can get to the event and about the designated "drop zones".