Unions campaigning for fair pay and conditions at culture and sport body Glasgow Life will step up selective strike action over the weekend and build to an all out strike day on Glasgow Fair Monday.
Three of Glasgow's best known attractions, Kelvingrove Art Gallery and Museum, the Gallery of Modern Art and the People's Palace museum will be targeted for strike action on Saturday 17 and Sunday 18 July.
And unions will call all Glasgow Life members out on a full day of strike action on Glasgow Fair Monday 19 July.
Sam Macartney, Service Conditions Officer for Glasgow UNISON said: "The message to Glasgow Life is clear - our members are calling for a fair deal over this Glasgow Fair weekend.
"UNISON along with the other Glasgow Life unions - Unite, GMB and BECTU - opposes Glasgow Life's unfair 10% pay cut for 150 workers and pay freeze for all other staff; and we want to protect existing conditions, including public holiday arrangements and overtime rates.
"We know that the people of Glasgow support us in this fight for a fair deal. Glasgow citizens know that our members provide an excellent service for the city, delivering the culture, leisure and sports services which they value. We believe that the people of Glasgow want their culture and leisure organisation to pay fair and play fair."
UNISON has criticised Glasgow Life management for breaching employment regulations by encouraging third party agencies to cross lawful picket lines in "desperate attempts" to break successful strike actions over recent weeks.
Sam Macartney said: "Our members have faced obstruction and hassle from third parties which management have hired. These unwanted intruders backed off when we started videoing their unacceptable behaviour. We believe the people of Glasgow do not want such actions to force unfair pay cuts and poorer conditions on the workers who provide them with much-valued services."