Is it lame to go to a Facebook party I haven't been invited to?

I see a lot of house party invites on Facebook that I haven't been invited to. In most cases a few friends of mine have been invited, but I haven't (apparently because I don't know any of the hosts). Is it cool for me to just show up, or is that lame?

Thanks for your thoughts.
Is it lame to go to a Facebook party I haven't been invited to?
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