Religious celebration (5,3)
I believe the answer is:
feast day
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">religious celebration</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for feast day that I've seen before include "Church holiday for eating and rejoicing - fed satay (anag)" , "festival" , "time to celebrate" , "Annual Christian celebration" , "Religious celebration" .)