To make a tuple with 1 element, append a comma in the parentheses:
>>> my_list = ['February 01,2011 - February 28, 2011', 'March 01,2011 - March 31, 2011']
>>> [(x,) for x in my_list]
[('February 01,2011 - February 28, 2011',), ('March 01,2011 - March 31, 2011',)]