Kensington Palace announced today that the Duke and Duchess of Cambridge and Prince Harry will host a reception at Buckingham Palace in honor of World Mental Health Day (Oct. 10). Recognizing the work of mental health advocates and organizations across the UK, the event is very much in line with the trio’s work on behalf of Heads Together. It will also mark Kate’s first public appearance since the announcement that she is pregnant with her and William’s third child and is suffering from HG.