Check out the Dahlem Research School's podcast! They also offer workshops based on the episodes:

The Dahlem Research School podcast for prospective and current doctoral researchers was created to help support individuals who are considering a doctorate or who are already working on a doctorate. Across various seasons of the podcast, you’ll hear from former and current researchers talking about their experiences with the doctorate and in their transition to the job market after completing their doctorate as well as from various experts at the Freie Universität and beyond. We hope this podcast will help support you in successfully navigating the challenging and exciting doctoral process.
After the release of an episode, short workshops will be offered where the topic can be discussed in more depth or experts will be invited to answer your questions.

The DRS also offers a weekly writing cafe via lounjee:

The goal of the Writing Café is to give you the opportunity to regularly devote time to your writing projects among peers. All doctoral researchers of the Berlin University Alliance (Freie Universität, Humboldt-Universität, Technische Universität und Charité) are welcome to join any time. Spread the word! The Writing Café will take place once a week - every Thursday in 2023 (either from 9-11am or from 6-8 pm - check the agenda). Write on your project in a group, alone or in tandems. An expert will be present to answer questions and provide brief one-on-one consultations (both English and German). Every last Thursday of the month the trainer will offer short input on different writing topics per your request.