If you are starting with the W3Schools tutorial, you should get through that in just a couple of hours, at most. In the remaining time I would suggest watching the video lectures listed in the following blog article:
- Learning JavaScript Programming Language through Video Lectures by Peteris Krumins
The author of that blog article wrote very detailed points on each video talk, so you can get a very clear idea of what will be discussed. The talks are given by Douglas Crockford, John Resig and Nicholas Zakas - all significant figures in the JavaScript world. These should take quite a big chunk from your weekend, but they should serve as a very sound introduction for when you go through "The Good Parts" book.
JavaScript is a very expressive language, and I hope learning it will be fun. You can really sense the enthusiasm of the speakers in the above talks when they describe some of the good features of the language, such as closures and first-class functions. Enjoy!
