Thank you for your request!
We are collecting API requirements for developing Office Add-ins in Excel, specifically for Events API.
If you are considering moving an existing COM/VSTO/VBA Add-in to Office Add-in, or creating a new Office Add-in in Excel, and have events requirements, please fill the survey below and help us focus on the right set of events and design. We truly appreciate your help!
Office Extensibility Team
Gary Miller commented
There are a couple of events that it would be nice to have that are currently available in the desktop version. For example Scroll events. Currently it is not possible to sync and AddIns UI with the Excel UI.