SATURDAY, MAY 15:The Montana Avenue Sidewalk Sale is happening on what we can all agree is plunk in the middle of the month of May. Meaning a few things. One, there may be a May-Gray-ish kind of day, seeing as how the 10-block shopping stretch is only blocks from the beach. Fingers crossed. And two, you can pick up graduation gifts and a Mother's Day gift, too, if you are late on that. Let's hope not. 15% to 80% PERCENT OFF: Those are numbers we can work with. Here are more numbers: Hours of the sale are 10 a.m. to 6 p.m. Date again is May 15. Multiple stores will be involved.