What would you say is the best possibility for a first-time-participant in to get informed about ticket sales without using ? I really want to be there, but I also really don't want to use proprietary social networks.

Or find the way to a local CCC group 😋 - where you maybe get a voucher for presale. (A rumor exists that the price would be 250€ )

That's a really good Idea! I will definitely try

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Instance mostly used by people who switched over from Twitter.