GNOME Evening @ FOSDEM
Easy enough, you just have to come to the GNOME event, see how cool it is and totally forget about the other one. Or you just can go to the other one later in the evening.
Saturday. Starting at 19h30. La Porte Noire. 67, rue des Alexiens.
There will be instructions at the GNOME booth about how to get there and there are tons of nice places to eat in the neighbourhood, so it will be perfect to start your evening.
But don't forget there are interesting talks on Sunday morning too!