@jackie-schmid,
Asana is definitely a favourite for content/editorial calendars. The ease of collaborating with teams, adding attachements, creating dependencies, building custom flows/boards and endless subtasks are all super useful when we create our internal calendars.
+ I work for Unito and we’re working on integrating Hubspot to other project management tools like Asana, Trello, Wrike, Jira etc. The idea is to sync tasks bi-directionally (from Hubspot --> PM tool and vice versa). If that interests you, you can beta test our connector by registering here 
Cheers!