What connects Elton John, Lions, Harry Potter and John Travolta?

The name "Dwight".

Elton John was originally named Reginald Kenneth Dwight.
https://en.wikipedia.org/wiki/Elton_John

Dwight Lions Lake is a reservoir in Livingston County in the state of Illinois.
http://www.fishingworks.com/lakes/illinois/livingston/dwight/dwight-lions-lake/

Dwight Schrute is a fictional person who is a Harry Potter fan.
"Dwight Kurt Schrute is a fictional character on NBC's The Office portrayed by Rainn Wilson ... He enjoys Battlestar Galactica, the Harry Potter franchise, The Lord of the Rings, Star Wars and Lost".
https://en.wikipedia.org/wiki/Dwight_Schrute
http://www.mugglespace.com/group/dwightschrutelovesharrypotter

John Travolta attended Dwight Morrow High School.
https://en.wikipedia.org/wiki/Travolta

Also another connection, less acurate though, is with the word "King"

Elton John : The main composer of Lion "King" Movie and musical.
https://en.wikipedia.org/wiki/The_Lion_King_%28musical%29

Lions as the "Kings of the jungle"
https://en.wikipedia.org/wiki/Lion

Harry Potter

"King's" Cross is featured in the Harry Potter books, by J. K. Rowling, as the starting point of the Hogwarts Express.

https://en.wikipedia.org/wiki/London_King%27s_Cross_railway_station

John Travolta: "King Of Cool" , A biography book on J.Travolta's life

http://www.amazon.com/John-Travolta-King-Wensley-Clarkson/dp/1844541258

The connection is Daniel.

Elton John sang Daniel
http://www.lyrics007.com/Elton%20John%20Lyrics/Daniel%20Lyrics.html

Daniel was thrown to the lions.
http://www.ainglkiss.com/bibst/den.htm

Harry Potter is played by Daniel Radcliffe.
http://www.imdb.com/name/nm0705356/bio

John Travolta played Danny Zuko in Grease.
http://us.imdb.com/title/tt0077631/

Another connection is Saturday night.

An early Elton John song is "Saturday Night's Alright (for fighting)"
http://www.eltonography.com/songs/saturday_nights_alright_for_fighting.html

Tonight (Saturday) the Brisbane Lions play the first match of their 2009 season against the West Coast Eagles
http://www.afl.com.au/Fixture/tabid/10586/Default.aspx

Saturday Night Live did an amusing Harry Potter skit
http://video.the-leaky-cauldron.org/video/show/148

John Travolta starred in Saturday Night Fever, a 1977 movie
http://www.imdb.com/title/tt0076666/