Y digwyddiadau yw’r rhai olaf o lu o wahanol weithgareddau sydd wedi eu cynnal drwy’r flwyddyn i ddathlu 30 mlynedd ers derbyn y statws rhyngwladol,  a byddant yn cael eu cynnal yng Nghaernarfon, Biwmares, Conwy a Harlech ar y 05, 06, 07, a 14 o Ragfyr. Mae’r sesiynau galw heibio anffurfiol yn gyfle i bobl ddysgu mwy am y safleoedd, a rhoi barn a sylwadau ar sut dylent gael eu rheoli.
The events, which take place on 05, 06, 07 and 14 December at Caernarfon, Beaumaris, Conwy and Harlech will be the final range of activities undertaken throughout the year to celebrate the 30th anniversary of receiving international status. The informal drop in sessions will be an opportunity for people to learn more about the sites, and provide views and comments on how they should be managed.