The running joke in Melbourne is about crossing the Yarra (so a north / south divide), but east / west divide makes sense too. Crossing from west/north suburbs to east/south suburbs with PT or a car is a pain in the ass so that’s a huge barrier to travelling across all sides of metro Melbourne easily. The Metro Tunnel will change that somewhat from a PT standpoint.

I live in a middle/outer NW suburb so travelling to only things close to me isn’t really an option, most of my work and social activities take me to inner north / western suburbs and the CBD. Rarely do I travel to the east/south unless I visit a few friends that live in the Bayside area, or if I want to visit a bay beach. Anyway, I think it’s a great idea for your Meetup to cross over and experience places in Melbourne you haven’t visited. Yarraville / Seddon is a great pick for those from the east side.