original_query: When did the former Prime Minister of Malaysia, Datuk Seri Mahathir Mohamed, attend the inauguration ceremony of Perkasa?
query: When did the former Prime Minister of Malaysia, Datuk Seri Mahathir Mohamed, attend the inauguration ceremony of Perkasa?
answer: The provided text mentions that former Prime Minister Datuk Seri Mahathir Mohamed attended Perkasa's inauguration ceremony, but it does not specify the date.