Saturday's Metzeler Post-TT Races have been cancelled as a result of torrential rain on the Isle of Man.
The traditional meeting on the Billown circuit near Castletown brings the festival to a close each year, but has been scrapped altogether due to prevailing conditions.
A number of top TT riders had been due to participate in the event, including Dean Harrison and Keith Amor.
William Dunlop had also been entered but would have been unable to take part after breaking a small bone in his leg following a heavy fall during the Senior race at Graham Memorial.
A statement issued by the organisers of the meeting said: “Due to the prevailing weather conditions and the forecast for the remainder of the day, in the interests of safety the organising Southern 100 Racing has made the decision to abandon the Metzeler Post TT Road Races due to be held on Saturday, June 7.
“The decision not to make use of the Sunday Road closure option was made by the organisers on Friday evening.”