Ferries between Dublin and Holyhead are cancelled or delayed due to "technical" issues.
Hospices caring for people at the end of their lives are at risk because funding is "unsustainable".
It is the second time in a year that the port has been fully closed to ferries.
Almost 40 million vehicles are predicted to travel around the UK in the days leading up to Christmas.
Terminal 5 at Holyhead has been temporarily closed, but the port will maintain a “full sailing schedule”.
Police and Border Force target UK entry points such as Holyhead Port to clamp down on people smugglers.
A cruise ship rise is boosting Wales' international profile and the economy, tourism leaders say.
Ysgol Kingsland and Ysgol Gymraeg Morswyn shut over unconfirmed reports of someone carrying an axe.
One of the berths, which had been closed for about seven months, will close until November.
