Southampton library workers were set to strike on Wednesday of this week against the closure of libraries and using volunteers to replace staff.
A walkout, the fourth in the campaign, is set to begin at 12noon.
It will be followed by a demo outside the civic office as councillors arrive for a meeting.
Unison union officials will hand over a petition of 5,000 signatures and also plan to speak to councillors.
Staff also plan to be in the public galllery during the council meeting.
The industrial action began in June this year with a one-day strike.
Staff are determined to fight the council’s plans to force the Tories’ “big society” onto the library service.