<image>In the December 2009 calendar shown below, enclose any 3×3 grid of numbers with a rectangular frame.
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(1) If the sum of the 3 numbers on the "diagonal" from the bottom left corner to the top right corner is 51, then the sum of these 9 numbers is ____. Among these 9 dates, the last day is the ____th;
(2) In this month's calendar, is it possible to enclose 9 numbers with a "total sum of 207" using the frame? If possible, find out the day of the last date among these 9 dates; if not possible, predict whether it is possible to enclose such a frame in next month's calendar, and if possible, predict on which day of the week the last date falls.