Thank you for inviting me to inaugurate the Book Exhibition in our neighbourhood. I am truly honoured by the invitation and deeply appreciate your thoughtfulness.
Unfortunately, a prior commitment on the same date prevents me from attending the function. Please accept my sincere regrets.
However, I wholeheartedly support this wonderful initiative and extend my best wishes for its grand success. I am confident that the Book Exhibition will be a valuable platform for promoting literacy and fostering a love for books in our community.
Thank you once again for the invitation.
This reply stays within the 50-word limit and expresses your regret for not being able to attend while still offering your support and enthusiasm for the event. It also maintains a formal tone appropriate for a principal’s correspondence.
- Replace “Tarun/Tanvi” with your preferred name.
- Replace “(College Name)” with the actual name of your college.
I hope this helps!