For most of the people we've met in the Cryptospace there has usually been one topic that brings everyone together, (even if they work for competing projects) and that's getting more people around the world to adopt cryptocurrencies and DApps. If you are developer then having millions of users on your easy to use DApp will increase it's value. If you are an investor having millions of people actively using whichever crypto currency you invest in is great for business, whether that currency is meant as a store of value or to be actively used inside a blockchain ecosystem.
So in the end when we talk about community, let's think big and incorporate the whole world in a model where everyone benefits from the services and use-cases that crypto currency can bring to the masses. Coming up we should be seeing more AI data analaysis (could even let you know how much money is flowing in and out of the major exchanges) , international banking, p2p property sales, video games which let you cash out in fiat or trade your items, Virtual Reality offices, real-time tracking for logistics providers.
There are a lot of applications for cryptocurrencies and their technology, we just need to build easy to use platforms and become global ambassadors for the industry, for our own projects and for the blockchain as a philosophy.
Making a user-friendly blockchain (plain-name wallet addresses, simple DApp downloads, multi-device mining) and building partnerships with relevant companies will go a long way towards building a global community for any of the projects you are interested in.