Guildhall Square became an open air dance floor on Saturday afternoon when dancers gathered for an impromptu performance ahead of the historic Fleadh Cheoil na hÉireann next month.
The flash mob event - where a group of people gather suddenly in one place for a performance - was staged in Guildhall Square at 3pm on Saturday and involved around 20 ceili and sean-nos dancers.
Passers-by, many of whom had been attending the Walled City Market in Guildhall Square, stopped and watched as the dancers appeared, seemingly out of nowhere, and started performing.
The crowd quickly grew and within minutes hundreds of people were watching as the dancers went through their steps.
At a prearranged signal, the dancers removed their jumpers and stood in a line with the letters on their t-shirts spelling out ‘fleadh cheoil.’
It is the second time a flash mob-type event has been staged in the city in connection with Fleadh Cheoil na hÉireann. In July 2012 dancers and musicians staged an impromptu performance in Foyleside Shopping Centre to promote the festival.
With just over one month to go before the start of the week-long celebration of Irish traditional music, the largest of its kind in the world, the organisers have said that excitement is building across the city.
More than 250,000 people are expected in the city during the Fleadh and it is expected to generate 40 million euro for the local economy.
Other events designed to raise public awareness of the Fleadh are expected to take place in the coming weeks.
Copies of the full programme of events to be held across Derry from August 11-18 are now available at various locations throughout the city.