http://www.gaa.ie/content/documents/...011_part_1.pdf
5.1 uses of property
(a) all property including grounds, club houses, halls,
dressing rooms and handball alleys owned or
controlled by units of the association shall be used
only for the purpose of or in connection with the
playing of the games controlled by the association,
and for such other purposes not in conflict with
the aims and objects of the association, that may
be sanctioned from time to time by the central
council.
(b) grounds controlled by association units shall not
be used or permitted to be used, for horse racing,
greyhound racing, or for field games others than
those sanctioned by central council.
(note: Central council shall have the power to authorise
the use of croke park for games other than those
controlled by the association.)
penalty:
In the event of any club, county committee, or provincial
council acting contrary to this rule, that body shall be
subject to suspension or fine, as deemed appropriate.