If you are building a software (or anything else for that matter) for a specific event that has a starting date carved in stone then you can't avoid deadlines.

If you are building a software (or anything else for that matter) for a specific event that has a starting date carved in stone then you can't avoid deadlines. Take some sporting event for example. Let's say F1 competition. You must have racing car ready by the start of the season. Having it ready two weeks latter is not an option.