There are hundreds of tech conferences around the world and everyone is different. One of them, @Scale, is a series of events for engineers who build systems working in huge scale. Systems which handle traffic from millions of people, have extremely complex infrastructure or are maintained and developed by tens/hundreds of software engineers.
Not everyone or every company will be there. But some of us for sure. If you want to be ready (or you are just curious), I highly encourage to see video recordings from lates @Scale Conference which took place at San Jose Convention Center, 31st of August.