I think you could be surprised by the types that would turnout to an act like Plaid
Market into the rock camp and electronica crowd and tack on the dance community for good measure, they appeal to music fans not ya average dance crowd
Put them in a venue that is people friendly and not overly fussed on what people wear - with a good, well priced bar and watch the beer disappear
keep ticket price as low as possible to grab the interested but not sure crowd
finally have them play at a time that is civil (i.e not 3 am)
Potential for gig of the year
Good luck and I for one hope it happens