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The surprise is supposed to be for the person whose birthday it is, idiot. [why do you need this explained to you.] Didn't you think it would disrupt too many people's schedules if you were having a surprise party for a big crowd?
[Wouldn't... everyone... show up...? Have a raised eyebrow, Daigo; you're just getting more and more confusing.]
Who wouldn't come? You invited everyone, right? [Such as it were. Sucking them into an illusion and having them wake up somewhere unfamiliar isn't an extremely great invitation, but if 'surprise' is what he's after he certainly succeeded.]