Politeia has invited two legal experts to talk at Who Decides the Law on Charities - Parliament or the Regulator? on 13 October. The think tank suggests the act may "even threaten charities' survival".
Hubert Picarda QC, former president of the Charity Law Association, and professor Peter Luxton, author of The Law of Charities, will debate whether the law is clear.
Dr Sheila Lawlor, director of the right-wing think tank, said the act posed a huge risk to smaller charities that could not afford legal advice.
She said: "The Government needs to consider whether it is clear and workable. If not, it needs to be looked at again."