Ask HN: Is there an app for calendar events?

As the title says, I'm looking for an app that I can use to share events for a non-profit organization I contribute to.

The usual go-to solution is Google Calendar, but after having used it for a few months I believe its UI/UX doesn't fit this purpose and is hurting engagement.

I've googled and tried a few solutions, but none of them would let me easily create something like what you would see in an event website like skiddle.com or visitberlin.de.

Is everyone really re-inventing the wheel each time? I find it hard to believe.