The Manx Grand Prix starts on Saturday, as long as there are enough marshals in place around the Mountain Course.
The message from the Isle of Man T.T. Marshals Association is simple - we need you even if it is for one session only.
Roads around the T.T. Course close at 5pm on Saturday and there is concern the practice session will be either delayed or cancelled.
Around 40% of the marshals on the Association database live on the island.
Chairman Terry Holmes is urging locals to help when numbers are thin ahead of visitors arriving on the island:-