I think it would be at first just Mitsuru standing by the gates handing out fliers while Haruki harrases them.
Until Koizumi comes up with the suggestion of the bunny girl suits to advertise so Haruki orders them. Koizumi is willing do dress up and hand out fliers but not Kyon. Until Koizumi, with the same trickery that got Ogiue to cosplay in genshiken gets her dressed up.
Of course it's Haruki that drags her out to the public and supervises them to make sure Kyon doesn't run back.