Feature Request: custom event_url

Hi, one feature I’d love to have is the ability to enter my own url for each particular event. I’m a classical musician, and the events I want to display on my site are mostly concerts with various orchestras or other groups. Often, these groups have their own sites with event information and such. I’d like to be able to just link directly to them rather than duplicating all the event info on my own site. Would it be possible to add a field to the Add Event page to enter a custom url? Thanks!