Editing selected calendar and remember last used calendar

Hi! I use multiple calendars, and sometimes, when adding events to Calendar B (which is second on the dropdown list, while Calendar A is selected by default), I accidentally leave Calendar A checked. However, when I try to edit the event, I can’t switch it to Calendar B because the option is grayed out.

My suggestion: Please allow editing the selected calendar and add a feature that automatically remembers the last chosen calendar when adding new events.