Snug
Too many hobbies and too little time?
Snug is a free weekly planner for people with more hobbies than week. Write down everything you want to make time for, drag it onto a calendar you can see all at once, and find out what genuinely fits before the week starts.
When a week looks right, Snug can send it to your Google Calendar. It writes to a calendar it creates just for you (or to your main one, if you prefer), and it only ever removes the events it wrote itself. It never reads what is already in your calendar.
No account is needed to start. You can build a whole week before Snug asks who you are; an account only matters if you want the plan on another device or in your calendar.