New this build: a new bookmark system for events, and an improved theming system!
The event sheet bookmark system is fairly straightforward. You can mark an event with a bookmark using Ctrl+F2 or the ribbon or right-click menu, and an icon appears by it. (Note this is currently just a red square placeholder - a better icon is coming soon.) Then you can press F2 and Shift+F2 to jump to the next and previous bookmarks in the project.
There's also a new Bookmarks bar which lists all the bookmarks in the project. This should help you be able to navigate quickly between the parts of the project you're currently working on.
Bookmarks are available in the Free edition, but the Bookmarks bar is only available with a license.
Improved theming system
A few releases ago we introduced the ability to customise the colors in the Event Sheet View. However it was a little limited in the specific colors you could set - for example, groups always had to be the same color as events. We've significantly increased the number of colors available to be changed. This means your themes can have even greater control over the appearance of the event sheet.
Since there's now a lot of colors to be set, we've added a new Edit Colors dialog to see a better overview of the theme colors and change them more easily.
Unfortunately, the new theme system is not backwards compatible with the old one. To prevent the colors going strange in the editor, the first time you open Construct 2 with r135+ it will revert back to the default theme. You can load your old theme file again, but it might appear incorrect. However hopefully the new Edit Colors dialog will allow you to quickly bring your theme up to speed and start using it again.