Most of this doesn't apply to Farallon Races, but here's the "Closure" language.

Southeast Farallon Island Special Closure

BOUNDARIES:
Except as permitted by federal law or emergency caused by hazardous weather, no vessel shall be operated or anchored at any time from the mean high tide line to a distance of 300 feet seaward of the mean lower low tide line of any shoreline of the Southeast Farallon Island year-round
EXCEPT:
The area north of Fisherman's Bay, from a line extending due west from 37 42.26' N. lat. 123 00.16' W. long., following clockwise around the island (including Fisherman's Bay), to a line extending due east from 37 42.05' N. lat. 123 00.07' W. long.
At East Landing, from a line extending due east from 37 41.83' N. lat. 122 59.98' W. long., following clockwise around the island, to a straight line connecting the following two points:
37 41.72' N. lat. 123 00.05' W. long.; and
37 41.68' N. lat. 123 00.07' W. long.
This closure exists year round, except for the following areas, which are closed only from December 1 through September 14 of each year:
From Fisherman's Bay to East Landing, from a line extending due east from 37 42.05' N. lat. 123 00.07' W. long., following clockwise around the island to a line extending due east from 37 41.83' N. lat. 122 59.98' W. long.
The area southwest of East Landing, from a straight line connecting the following two points:
37 41.72' N. lat. 123 00.05' W. long.; and
37 41.68' N. lat. 123 00.07' W. long.
Following clockwise around the main island to a straight line extending due south from 37 41.76' N. lat. 123 00.16' W. long. to 37 41.64' N. lat. 123 00.16' W. long., and on the southeast side of Saddle (Seal) Rock, from a straight line extending due south from 37 41.76' N. lat. 123 00.16' W. long., following clockwise around Saddle (Seal) Rock, to a line extending due west from 37 41.60' N. lat. 123 00.26' W. long.
More than 250,000 seabirds of 13 species breed on the South Farallon Islands. The islands also provide habitat for six species of marine mammals, and the surrounding waters are a feeding destination for white sharks. This Special Closure protects resting and nesting seabirds and provides a protected resting area for marine mammals.
Permitted/Prohibited Uses: Take of all living marine resources is prohibited.
Other Regulations:
No person shall enter the area, except for agencies identified in Title 14 Section 632 CCR, when performing their official duties.
All vessels shall observe a five (5) nautical mile per hour speed limit 1,000 feet seaward of the mean lower low tide line of any shoreline of the Southeast Farallon Island.
In an area bounded by the mean high tide line and a distance of one nautical mile seaward of the mean lower low tide line of any of the islands and islets comprising the Southeast Farallon Island, the following restrictions apply:
All commercial diving vessels operating in the defined area shall have their vessel engine exhaust system terminate either through a muffler for dry exhaust systems, or below the vessel waterline for wet exhaust systems.
All commercial diving vessels equipped with an open, deck-mounted air compressor system, while operating in the defined area, shall have their air compressor's engine exhaust system terminate below the vessel waterline.
Boater and Kayaker Guide to Special Closures in California’s Marine Protected Areas – includes detailed information on each of the Special Closures along the north central coast.