Ms Braverman has denied claims that she is set to defect to Reform UK, with her spokesperson and a fellow Tory MP confirming she is not joining the party.
The event will see Ms Braverman present a paper detailing why and how the UK should withdraw from the European Convention on Human Rights, a cause she has long championed.
Lord Frost, however, has not ruled out running for Reform UK in a future general election, stating he is not emotionally committed to the Conservative Party.
The gathering follows a series of recent defections by other prominent Conservative figures, including former culture secretary Nadine Dorries, to Reform UK.