Wednesday's scheduled action at the Southern 100 in the Isle of Man had to be postponed because of bad weather.
Superbike, 250, Classic and Sidecar events had been scheduled to take place but action should resume on Thursday with 600 and superbike races.
William Dunlop and his brother Michael claimed the first two places in the opening 250cc race on Tuesday.
Winner William set a new lap record for the event in taking the victory ahead of his brother with Chris Palmer third.
Ryan Farquhar took second in the 1000cc race behind Guy Martin, who set a lap record of 111.15mph in taking the win, while Ian Lougher was in third.
Omagh rider Adrian McFarland claimed victory in the 600cc race.
The 600cc race was run concurrently with the 1000cc event.
Davy Morgan, John Burrows and Nigel Moore finished fourth, fifth and sixth in the 250cc race while Conor Cummins and Michael Dunlop were fourth and fifth in the 1000cc class.
Victor Gilmore was seventh in the 1000cc race with Davy Morgan in eighth.
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