Union members, who organised the demonstration, are outraged at the actions of the book printing company, which they claim owes workers nearly £400,000 in wages and pension contributions.
Staff have maintained a picket at the premises in Frome since the plant closed, attempting to disrupt delivery of the final orders being produced by a skeleton staff.
Unite national officer Ann Field said: "We are hoping that as many people as possible will attend the demonstration to support the sacked workers and their livelihood.
"B&T are the biggest firm in the town and have employed local people, including many families, for generations."
Unite has pledged to take steps to retrieve the money owed, including all entitlements and compensation.
Today's demonstration will begin at 4pm.
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