R.I. Gen. Laws § 25-2-2: Artillery salute and display of flags on Rhode Island Independence Day.

On each and every fourth day of May, except when the day falls on the first day of the week (commonly called Sunday), then on the day following, the governor shall cause salutes of thirteen (13) guns to be fired, at 12 o’clock, noon, by detachments of the state artillery at all places in the state where stationed, and shall cause a display of state and national flags on all armories and other state buildings from sunrise to sunset, in celebration of Rhode Island independence.