Question

what was the strange incident that occurred the evening before nimai was to be cut down

Answer 1

Shyamal came in with the news that his father were buying a new car then after listening this news he became very happy but her mother also brought a bad news that they had tocut the nimai tree to make garage for the new car then he and his father started fighting.
After this incident Nimai saves Shyamal's father from lightning which ultimately kills Niami.

Answer 2

SHYAMAL CAME IN WITH THE NEWS THAT HIS FATHER WERE BUYING A NEW CAR THEN AFTER LISTENING THIS NEWS HE BECAME VERY HAPPY BUT HER MOTHER ALSO BROUGHT A BAD NEWS THAT THEY HAD TO CUT THE NIMAI TREE TO MAKE GARAGE FOR THE NEW CAR THEN HE AND HIS FATHER STARTED FIGHTING.AFTER THIS INCIDENT NIMAI SAVES SHYAMAL'S FATHER FROM LIGHTING WHICH ULTIMATELY KILLS NIMAI.

HOPE IT HELPS YOU GUYS.