Based on the clue 'at picnics miss manners says one may kill these bu...', what is the answer?

Based on the clue 'at panquetzaliztli an aztec festival those not per...', what is the answer? Based on the clue 'at parris island marines learn techniques for usin...', what is the answer? Based on the clue 'at passover this thief was freed in place of jesus', what is the answer? Based on the clue 'at penn the head of the college of arts sciences ...', what is the answer? Based on the clue 'at pittsburghs the point the allegheny monongahel...', what is the answer? Based on the clue 'at prague tech we wonder if this physics professor...', what is the answer? Based on the clue 'at prep school along with latin lacrosse i learne...', what is the answer? What is associated with: at prince charles 50th birthday party he camilla danced perhaps prophetically to this regal 19…