The topics of these events are still unknown, but it is likely that one will focus on Chrome for Android, while the other will focus on Chrome for iOS.
Google has event readied two video channels which will live stream the events and you can bookmark this page to follow the events at their set times.
Speculations suggest that Google maybe adding support for extensions for the mobile platforms and that we maybe seeing deeper desktop integration. In either case, we wont have long to wait to find out.
We are also curious if Google for Windows Phone will finally make an appearance.