photo opportunity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A brief period, as at a high-level meeting or conference, during which the news media is invited to photograph or film public figures or other people, usually without being allowed to ask questions.
• noun An event designed primarily to generate positive media coverage for an attending politician or other public figure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any occasion in which a politician or other celebrity may be photographed to their advantage. Short form: photo op

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed