Sure you can - this is how I would do it - go into the calendar, click settings- it look s like a red cog. Then go to min/max stays, click add a requirement for seasons or weekends, and then if you click the drop-down next to "during" (it gives you whole seasons, or you can choose the option "specific dates" which you need to scroll further down for and fill in the start and end dates and put the minimum in as 2 or 3.