Sentence:  Hester Earle and Violet Wayne were moving about the aisle with bundles of wheat-ears and streamers of ivy, for the harvest thanksgiving was shortly to be <WSD>celebrated</WSD>, while the vicar stood waiting for their directions on the chancel steps with a great handful of crimson gladioli. 
Meaning of the word marked with <WSD> tags:  To honour by rites, by ceremonies of joy and respect, or by refraining from ordinary business; to observe duly; to keep.