Bilbo's birthday is documented in The Lord of the Rings and in the appendices. It is September 22nd.
Daisy
During the riddle game, Gollum’s ring is in Bilbo’s pocket.
That no one will mistake him for a dwarf (he has no beard).
The huge hoard of treasure that Smaug owned took away Bilbo's breath. And specifically the Arkenstone.
Rupert Grint' birthday is August 24th.
Daisy
Bilbo's surname is Baggins.
Thorin
The Goblins Know someone is at the gate because they see bilbos shadow and believe that someone is there. And when Bilbo goes to get threw the gate his brass buttons pop off.
During the riddle game, Gollum’s ring is in Bilbo’s pocket.
saved them from the spiders
A share in Smaug's treasure and adventure.
we do not know when this birthday is
That no one will mistake him for a dwarf (he has no beard).
All thirteen of the dwarves, followed by a chuckling Gandalf.
3 people that I know have th same birthday as me.
because he ends up finding the ring when he is feeling his way around in the dark