Here is the difference. 17:41 Mar 30, 2011
A media advisory, like a press release, is used to send newsworthy (or “timely”) information to members of the media. However, media advisories are more highly specific. Media advisories tend to deal with event news, and serve as a sort of invitation for journalists to attend.
The Difference Between Media Advisories and Event Press Releases
Many individuals and companies send press releases to journalists prior to an event. These event press releases aren’t the same thing as a media advisory though. Their purposes are different.
An event press release is sent to the media in the hopes that journalists will at least mention the forthcoming event to the public, to raise awareness about the event, and to hopefully lead to increased public turnout.
On the other hand, the purpose of a media advisory is to invite members of the media to attend an event, that may or may not be public, with the aim of having the event, or the information released during the event, covered by the news media. A media advisory’s job is to tell journalists the Who?, What?, When?, Where?, and Why?, and any additional details relevant to them (such as where they can park and set up equipment prior | 
The translation workplace 
