A live link will be made with Hearts Content, the point where the cable comes ashore on the Canadian side.
On this day 150 years ago at 2:30 pm, the first communication was made between Valentia cable station and the cable station in Hearts Content, Canada.
At 5pm, a simultaneous unveiling of commemorative marine bollards will also take place in both locations.
The celebrations will finish with a historical lecture entitled The Trans-Atlantic cable of 1866 by Bill Burns.
Fiona Lyne is Communications Officer with the Transatlantic Telegraph Cable Festival.