Well Sikhs have been celebrating Diwali long before the events pertaining to Bandi Chhorr Divas occurred. It was our second guru, Guru Amar Das Ji, who instructed that we celebrate Diwali, not for the return of Ram, however for the remembrance that good prevails over evil, and that we should always "enlight" ourselves over ignorance. We should also celebrate Bandi Chhor Divas as well, as it is again the victory of good over evil, however it is also the celebration of our Guru (Guru Hargobind Singh Ji) returning from captivity. So there you have it.
Congratulations to you singh ji only I wish I could've taken Amrit (Amrit sanchar tomorrow at my local gurdwara) but it's all maharaj's hukam. Please do update this post to let us know more about it thank you 😊