Based on the context and the answer, generate a question. 

Context: Then a week Wednesday I head out for the conference and for delicious time with James . Our friend Joseph is coming to visit tonight . He was supposed to come tomorrow night , after attending the IWW organizing conference this weekend , but then his planes got delayed and canceled and he 's spent the last 24 hours bouncing all around the continent . So he 's skipping the half of the conference that he had n't already missed and coming directly here .

Answer:

His plane was cancelled and he changed plans .



Why may he have been skipping the conference ?