Ask HN: What would you expect from an event service?

I'm a part of a 3 member team and we're building an event service. By events we mean all sorts of them: conferences, expos, cultural happenings, etc.. Mobile apps and a web one are in progress.

We're to launch beta in few weeks and we're interested in what would a user expect from this kind of service. It's really important for us to have the key segments polished and to have an insight if we're on the right track.