You have several options:
Set Chrome as your default browser - If you have no trouble in using Chrome, then you can set it as your default browser.
To do this:
Click on the Apple menu and select System Preferences.
Choose the General tab.
Just over halfway down, there's a menu next to “Default web browser.” Click on it and choose the browser you want to set as the default.
Copy and paste the link - Though highly manual, you can copy and paste links into Chrome if you don't have a lot of them.
Use a third-party software - There are some third-party software that could offer this. As mentioned in @Craig Stodolenak' answer it looks like Choosy could do this. I am not affiliated with the software.
I understand what you are trying to do but there's only one setting for a default browser in OS X in System Preferences > General > Default web browser
I asked a question about this on Stack Overflow here:
Here is an alternative solution, tested under macOS High Sierra
10.13.6 and it worked:
- Automator > New > Service
- With settings: Service receives selected text in Calendar
- Add a Run Shell Script action, with settings:
- Shell: /bin/bash
- Pass input: as arguments
- Replace the default code with:
open "$1" -a "Google Chrome"
- Save it as: Open URL in Google Chrome
Then in Calendar, right click on the URL and select Open URL in
Google Chrome from the Services context menu.
It's not a single click scenario, but gets the job done.