Obon, which was July 15 in the old calendar, is held on August 15 (one month later or 'tsuki-okure') in most areas, and there are many companies which have set the period around this day as Summer holiday (the Obon holiday).
旧暦7月15日(旧暦)のお盆は、ほとんどの地方で月遅れの8月15日に行われ、この時期を夏休み（お盆休み）としている会社なども多い。