Friday is a holiday in Bangladesh.
It is weekend.
Besides, it is muslim’s prayer day.
Since majority in Bangladesh is muslim,
you can see a huge gathering for prayers
by muslims in mosque at noon time.
Most of the people wear traditional muslims dress
with white muslim cap.
You can see huge gathering after prayer finished
when people go out of mosque.
Sometimes some small roards in front of
mosque are blocked for prayers.
If you are new in Bangladesh, you may have a curisity
seeing a gathering at noon time with white dress people.
So now you have an answer of it.