We're not successful until you are!
Robin: A Mixer in Hilo would be great. Either you, or someone else on the Big Island, would have to take the initiative and get it organized. There's a Group page here on the HAN website specifically for talking about and organizing Mixers:
You should head over to that page and post your idea about a Hilo Mixer there so that others know of your idea and can help out in organizing it.