You dont want to be at the DJ stand when the First Dance is played or theres a speech because its embarrassing.
And anyway the DJ only mumbles through a muffled pa system.
Your suggestion appears to be you want to start the first Dance but not be at the decks.
My suggestions--
Get a remote and possibly use a mini disc player.
Get a Peavey 4 speaker system like mine and you WILL be heard.
This may have missed the point--
Why would you be in the crowd
Oh I see people only get going when your in the crowd--nothing to do with the music then???