At least five Australian conference venues booked to host American anti-vaccination campaigner Sherri Tenpenny have cancelled the events as pressure mounts over her speaking tour.

The controversial osteopath who claims vaccines are linked to autism, asthma and auto-immune disorders, was due to begin a series of anti-vaccination seminars in Melbourne on March 1, before travelling to Adelaide, Sydney and Brisbane.

Some conference venues have cancelled events as pressure mounts over Sherri Tenpenny's speaking tour.

Tickets for a dinner with the high-profile campaigner, who says she is a medical practitioner, are also being sold on booking system eventbrite for up to $200. The dinner was meant to take place at the Amora Hotel Riverwalk in Melbourne on February 28.

But on Thursday, general manager of the hotel Tim Bilston said he had cancelled the event for "commercial reasons".