If you make a mistake in the form, you can simply fill it in again and overwrite the incorrect data, so don’t worry about that. If necessary, I also have access to the database, so I can manually remove any incorrect entries.
One more important piece of information: the competition ends when the last remaining participant fails to complete three stages in a row, so we don’t know in advance when it will happen. It’s not the case that the end of the month means the end of the competition.
There have been situations where the best participants continued for more than 50 additional stages and reached that far.
So it’s worth keeping in mind that after March 31, when the task is to make 31,000 steps, the next day is April 1, when the task becomes 32,000 steps.