Roads around the Billown Circuit in the south of the Island will close at 6.05pm today (Friday), at the start of the Blackfords Pre-TT Classic meeting.
The first practice session will get under way at 6.15pm and the roads will reopen no later than 9.35pm.
There will be a further practice session tomorrow afternoon, with one race at 4pm.
The rest of the race programme takes place throughout the day on Monday.