The Parliamentary Protective Service expects 500 people to gather this weekend to mark a year since the "Freedom Convoy" occupied downtown Ottawa.
The agency, which polices the precinct, says it will curtail some access to Parliament Hill.
The public can still use the central and east gates to access the Hill lawn, but not the gates closest to the West Block, where the Liberals are holding their caucus meeting this weekend.
The Parliamentary Protective Service says public tours have been cancelled and Ottawa Police will enforce the closure of Wellington Street to traffic.
Ottawa city council voted this week to reopen Wellington Street to cars as soon as March, after a yearlong closure.
Large trucks occupied the street for weeks last year, and were only removed after the Liberal government invoked the Emergencies Act.