Want another tip? Since today is only the right 1/3 of the vis, it's probably a better idea to move the legend to the right. (the dates and colors). I would also align them horizontally instead of vertically, that way you avoid them overlapping your high price lines.

Finally, it's possible to add a little white outline to your text, that makes it a lot easier to read it against a striped background like you have (NYTimes does this a lot)

You might also want to take in some of the margin on the left side to move the price closer to axis label