The rally will be at 12.15pm at Kingswood Community Centre and the union says everyone is welcome to attend and hear speeches.
Last Saturday’s strike by around 190 staff, including library assistants, care assistants, civil enforcement officers and staff working at the Vinney Green children’s secure unit, was in protest at what Unison says is an average 10 per cent cut to their pay.
The council introduced new contracts this week for staff who have to work weekends. Unison says pay rates for Saturday working have been cut by 33 per cent and that many of the workers affected are low paid, mainly women and part-time.
A c ouncil spokesman said: “Some services provided by South Gloucestershire Council could be affected by industrial action this Saturday.
“Members of the Unison union have voted for a further one-day strike in response to changes to council policies on enhancements and allowances paid to staff, which were introduced on 1st October.
“The full impact of the action will not be known until Saturday but it is likely that library services will be affected. The council is working to ensure that service disruption to the public is kept to a minimum. “