With enough children for five baseball teams, plus a couple extra, the students in Susan Skolski's and Jennifer Morse's kindergarten classes celebrated what they thought would be Opening Day at Fenway Park on Monday with a special lunch and a Red Sox parade. The rain that canceled Monday's Red Sox home opener had no effect on the celebration at Sacred Hearts School, however, which went of without a hitch. The 47 students in the two classes donned their Red Sox gear, drew posters and pennants, and marched around the school grounds to show their pride in the two-time world champions.