For T20 World Cup many activities are being planned. Some activities are going simultaneously and some are dependent. E.g. Activities related to stadium such as pitch preparation, arrangement of food stall etc. will go on simultaneously. But flight booking, hotel booking, pick up arrangement should be done in certain sequence. Every activity should be done within the estimated time. Most important is relation of activities with calendar dates.
This web of dependent activities, time and manpower estimation against calendar is known as schedule. Schedule is considered as time baseline or yardstick. It works as a map for any project. Avoid any project without schedule to avoid delays