First, welcome to Postgres community and Postgres Women. I'm Lætitia Avrot, Postgres expert, Postgres Women co-founder and Member of PostgreSQL Code of Conduct Committee. I'm sorry I won't be there in Germany to welcome you in person, but I know you will find wonderful people there!
I will make sure you get your free ticket for PGConf.de. It's given by Crunchy Data which is a company that do a lot for Postgres and Postgres Women too.
I'll send an e-mail where I will introduce you to Jonathan Katz who will take care of your registration for Crunchy Data.