There are two Contests held in Autumn each year that members are encouraged to enter. Toastmasters International provide a number of documents which as either a contestant or organiser you will find useful.
Each contest is governed by a set of rules which all participants should be familiar with. Speech Contest Rulebook
Contestants and Judges should download the ballot sheet which explains the criteria on which each speech should be judged.
Every contestant must complete a declaration of eligibility which is carried forward to each round of the contest and a contestants profile to be used during the contest.
Judges are also required to complete a declaration of eligibility and code of ethics.
There are other documents needed to run the contests effectively and organisers can ownload them here.