What can we serve guests on a warm QLD summer evening (canape/standing)?

I am looking at catering options for a standing event wedding in Dec, on the coast of QLD. We love our venue, but I am concerned that we won't have air-conditioning (though it is a rooftop venue, so hoping for a nice breeze). I would love some ideas on what I can serve guests, that won't wilt, sweat or weigh everyone down on a hot summer afternoon! Thanks