This time you'll get an introduction to Reactive Programming by Ferran Maylinch, one of our senior developers at itnig - currently working at Gym For Less.
Ferran will explain the relation between callbacks, promises and reactive streams. How each of them is based on the previous one: from callbacks you build promises, and from promises you build reactive streams.
Learning it is hard, even harder by the lack of good materials, but we'll hopefully give you the keys you need to start out!
See you there for some cold beers and a good discussion.