Do I need any special permission to run a Malairte workshop in a public library?

In most public libraries, you only need to book a meeting room like any community group. Be straightforward with the librarian about what you are teaching: open source wallet software and the basics of mineable cryptocurrency. Describe the session as educational, free, and non-commercial. Hand them a one-paragraph summary they can share with their manager if asked. Libraries are usually fine with this once they understand you are not selling anything. If the library has a no-cryptocurrency policy, respect it and find another venue rather than arguing; the goodwill matters more than the room. Always follow the venue rules on food, noise, and tear-down time, and leave the room cleaner than you found it.