Yes, there is a National Fiancé Day, though it is loosely observed and is most notably recognized on August 1st. This day is dedicated to celebrating and appreciating one's fiancé or fiancée, focusing on the love and excitement between the engagement and the wedding. It is a day to take a pause from wedding planning and enjoy the special bond of being engaged.
Additionally, there are related days such as National Kiss Your Fiancé Day on March 20th, which encourages engaged couples to relax and enjoy romantic moments amid wedding preparations.