Daily is for an event that occurs on consecutive days during the same time period. For example January 1st - January 5th at 1:00 - 2:00.

Weekly is for a specific day(s) every week during the same time period. For example, every Tuesday & Thursday from January 1st - March 30th at 1:00 - 2:00.

Weekly is also used for an event that occurs on more than one day in a week, but not on consecutive days. For example, the week of January 1st - 7th on Mon, Wed, Fri from 1:00 pm - 2:00 pm.