Study the following information to answer the given questions:
•Six plays are to be organised from Monday to Sunday - one play each day with one day when there is no play. ‘No play’ day is not Monday or Sunday.
•The plays are held in sets of 3 plays each in such a way that 3 plays are held without any break, ie 3 plays are held in such as way that there is no ‘No play’ day between them but immediately before this set of immediately after this set it is ‘No play’ day.
•Play Z was held on 26th and play X was held on 31st of the same month.
•Play B was not held immediately after play A (but was held after A, not necessary immediately) and play M was held immediately before Q.
•All the six plays were held in the same month.
Which date was a ‘No play’ day?