One doubt about a place for an install party

[Costales]

Hi! I'm the coordinator of Ubuntu-ast.

We're working for a presentation & install party the April 30th of
Ubuntu 11.04, and I'd like to ask you about the place: FNAC
http://fnac.com. It's a big store in Europe, they sell books, music,
computers, cameras...

FNAC likes our event, but, is this "ethical/good" for us (as LoCo)?
Are there any rules about this?

Why am I asking this?
Because FNAC does not sell/support Ubuntu computers. On the other
hand, the event could spread the Ubuntu message to a lot of people and
it will be a big impact in press and media.

Best regards and thanks in advance! :)