Can I continue to edit my calendar after the purchase or start date?
You can edit a calendar at any time and from any device. This means that even after purchasing and even after the calendar has started, you can still completely revise it and fill doors. All you need is your editing link, so keep it safe! Of course, it's better to create an account so your calendars are always saved.
Just make sure that the door for the next day is always filled with content so it can be opened by your users!