Donnau115 is a bar which has a storied open mic every Tuesday run by a wonderful guy name Chad. There’s always a lot of musicians who want to play so this is what you have to do:

1. Arrive before 19:30. Someone will put out a board with the QR code to sign up with at 19:30.
2. Scan the thing, fill in the form and sign up. Note: it would probably be a good thing to have a link handy that showcases what you’ve done before. Not necessary but maybe helpful.
3. Wait around and smoke some cigarettes or something
4. Check the site if you’ve made it to the list. This will be updated each night: http://www.donau115.de

I’ve also written about it here: https://perth.timothylim.is/a-year-in-berlin