We use Workboard but are thinking of moving to Trello. Workboard allows you to create meetings, which are separate from tasks (equivalent to Trello card). There is an integration which means any meeting created in Workboard is pushed into your other calendars. This is very efficient:
1) You have a view of all your tasks and meetings in Workboard
2) Your meetings are pushed through to your other calendar so you can avoid double booking yourself, e.g. scheduling a work meeting when you're supposed to be going to the parent teachers evening
Is there an equivalent functionality in Trello?