The chief executive of food giant Kraft will visit Cadbury's main UK factory in Birmingham on Thursday for the first time since the US firm bought the chocolate-maker this year.
Irene Rosenfeld will meet employees and management at the site in Bournville and is expected to hold a question and answer session with workers.
Jennie Formby, national officer of Unite, which campaigned against the sale, said workers will be pleased that Ms Rosenfeld is finally visiting the plant.
"But they will also want to ensure that she makes the time to meet with their representatives, Unite stewards, to assure them of a bright future for all Cadbury/Kraft sites in the UK and Ireland.
"Unite urges Ms Rosenfeld to use some of her time here to do just that."
Unite is continuing to press for a so-called Cadbury's Law to prevent the hostile takeover of healthy UK businesses and to deepen shareholder responsibility towards the long-term well-being of companies in which they have a stake.
"We also want a Mergers and Takeover Commission to be established to review UK law which, as with Cadbury, means that while shareholders can pocket hefty profits, the workforce is left without jobs guarantees and uncertainty about the company's future piles up alongside the debt amassed by its purchaser," Ms Formby added.