Thanks for the suggestion Free sounds good)
That being said, for 2020 the location will likely be near Frankfurt. Someone is working on that now. Zuerich could be a fallback if Frankfurt would be too expensive, Bear in mind that we are not only looking for a location, but also someone who can do some local organizing, like arranging a discount on hotel rooms, finding out about public transport details to be published on the website and stuff like that.
And there is always 2021.....