Increase event description limit

I’m talking about the text box under Description when you create the event

This shows up in the event as such

We are a running club and use the desciption for turn by turn directions, and if the route gets long there is concern there isn’t enough room.

The additional text is in the topic, but if the user saves to their calendar it isn’t visible on their calendar entry (at least for google calendar), but the description is.