Move old calendar entries to another folder?

[robgnu]

Hello,
I have some heavy calendar users (> 3000 entries). Most of the entries are not longer needed, so I’d like to move them to another folder (CalArchive or so).

Does anyone know a best practice how to bulk move many calendar entries to another folder? Like: All entries older than 2 years -> move to CalArchive.

It is tedious to do this manually by WebApp.

Thank you
Rob.