A service in memory of Armed Forces personnel who have paid the ultimate sacrifice was held in the city’s Guildhall Square.
Darren Jones said it will depend on the outcome of the strategic defence review, which is currently under way.
It is the first time the Princess of Wales has carried out two consecutive days of engagements this year following her surgery and cancer diagnosis.
Her speech will come against a backdrop of criticism from the hospitality sector about changes to national insurance contributions.