Between 11am–4pm on 14 June 2025, an open day celebrating the prehistory of Wales and beyond will take place at the Bryn Celli Ddu.
Rhwng 11–4pm ar 14 Mehefin 2025, cynhelir diwrnod agored yn dathlu cynhanes Cymru a thu hwnt ym Mryn Celli Ddu.