The Notice of Race or the Sailing Instructions of an event can change or delete rule 55.

Authorizing a club to organize an event does not make a class part of the organizing authority.

The Post-Race penalty under rule T1(a) is not an additional penalty option available to boats at the time of an incident. It is only available to boats realizing that they might have broken a rule when it is too late to comply with rule 44.2..
By knowingly breaking a rule and not promptly taking a penalty, the boat violated a fundamental principle of sportsmanship, therefore she also broke rule 2.

When a finishing line inflatable mark drifts out of position, the race committee can properly substitute it with a vessel displaying flag M and making repetitive sound signals. 

A boat breaks rule 18.3 at the finish line when she causes a boat who has been on starboard tack since entering the zone to sail above close hauled to avoid contact.

Pumping out bilge water for the purpose of changing a boat’s trim or stability does not break rule 51, however, class rules may limit the amount of bilge water allowed and/or put restrictions on the time and/or the type of bilge pump used to bail water out.

An organization is affiliated if it is affiliated to the national authority of the venue; otherwise the organization is unaffiliated

An organization may be affiliated to the national authority either directly or through affiliation to an entity which in turn is affiliated to the national authority.

For the purposes of the Racing Rules of Sailing, the national authority is an entity. Representation or jurisdiction of persons or bodies within the entity is not governed by the Racing Rules of Sailing.

 If the national authority decides that the new and timely delivered evidence is also significant and might have led the protest committee to change its decision, it may reverse the decision of the protest committee and order that the hearing be reopened.