I work at Odecee. It is a technology consultancy company with a difference. They understand that people are their main and only asset, so they tend to hire smart IT professionals, pay them well, and give them cool toys.
Every week they run brown bags in their office. A "brown bag" means a lunchtime presentation where attendants are supposed to bring their lunches (in brown paper bags, hence "brown bag"). Yet, Odecee also provides catering for those events.
We have monthly sessions on web development, DevOps, mobile development, and "kitchen sink" (tech topics which don't fit into any other category). However, employees are invited to speak on any other topics they are passionate about, whatever drives them, makes them tick.
I myself recently took an opportunity to present a brown bag on the basics of iOS music production. The reason I wanted to talk about music to a technical audience is because engineers often see the world through a lens of their technical skills. They like no one can benefit from a creative freedom music gives them. For engineers music, especially electronic music, is a perfect creative media. It is technical but, at the same time, it is unstructured. It obeys laws of physics but musicians don't need to rely on formulas to create.