yes
Some people who celebrate Christmas might put up lights there
To put the present under it
Because they want to.
because it is a traditon
Some people have a star or an angel on top of their Christmas tree.
In Australia, many people put up their Christmas tree on the 1st day of December. It varies. There is no tradition in Australia for when to put up the Christmas tree. Some people put it up early in December, while others put it up at various times in the weeks preceding Christmas. Some may leave it until Christmas Eve. There is truly no tradition.
You can put ornaments on a Christmas tree.
lights, ornaments, presents, partridges.
they build a snow tree and put candles on it
19th of july
sorry i don't now that answer
If they're Christian, they might. The majority, of course, are not.