Anirudh Bhati wrote:
As far as I know, the WMF is providing assistance to the attendees by sending out a letter of invitation, which they can annex to their applications to the respective Egyptian consulates / missions in their country. This allows for smooth visa processing and clearance. Since Egypt is a country that largely depends on tourism as a major source of its revenues, there will hardly be any problems for the tourists at the immigration counter, unless and until there are sound intelligence or political grounds.
In the unlikely event that a Wikimania attendee is restrained from entering Egyptian territory, they would most likely be deported back to their country, and there is hardly anything that a private organisation like Wikimedia Foundation can do about it. The issue is then more diplomatic or political, than just bureaucracy.
Also, the major airlines do a certain amount of pre-screening. When they bring an inadmissible person they are the ones stuck with the costs of getting that person back to where he came from.
Ec