Guild Wars 2

So we just started a new guild and I was wondering if you all wanted to do a guild rush but it was only open on one of the servers that if everyone guested to that server if they would all be allowed to participate in the guild rush or if they would have to unlock it first on their own server.

‘You can receive rewards from guild missions that are started on a world that you are guesting to.’
Source: http://wiki.guildwars2.com/wiki/Guild_mission#Notes