When I'm in calendar view in ClickUp mobile and have a date selected, I will tap the blue 'add' button on the bottom right corner to add a task on the selected date. However, the task that is created has an empty start and end date.
On a number of occasions, I have accidentally created undated tasks, which are hard to find again.
Proposing that the behaviour is either:
Double tapping on the date in the calendar view creates a new task on that date; or
Clicking the add button creates an event on the activated date.