Import calendar entries, not sync

Background, my client has 5 employees. They are using Office 365 and Exchange for email and calendaring. We are switching to SuiteCRM. (Finally!)
My plan is to hide their Outlook. We have had syncing issues, because of the size of some PST files. In short, I want them to only use SuiteCRM for email and calendaring, so they don’t have 2 places to work in.
I have already imported their contact lists. No problem there. But now I need to import each user’s calendar entries. I found the iCal link in my profile, but I can’t see anywhere to import a CSV or ICS file.