The changes come into effect from April 6.
Current rules allow workers to be employed via a personal service company (PSC) which determines whether IR35 tax rules should apply.
That responsibility will shift from April to contractors who will determine employment status.
Freelance workers fear losing out through higher tax payments while contractors would also face bigger bills from direct employment.
The changes were due to come into force in April 2020 but were pushed-back due to the coronavirus outbreak.
Construction had hoped the new rules would be delayed again but those hopes were dashed by the government.
HMRC said: “We want to make sure people in construction are aware of their obligations so are providing supporting and education for businesses and individuals in the run up to changes.”
The online workshops are taking place on 19 ,20, 26 and 27 January.
Companies can sign up for the events here.