Looking at the events calendar on the Saddledome's website, these are all the concerts that played the Saddledome in 2015:
- Bryan Adams - Jan 16
- Tragically Hip - Feb 9
- Nickelback - Mar 12
- Eric Church - Apr 11
- Def Leppard - Apr 22
- OneRepublic - Apr 30
- Neil Diamond - May 2
- Imagine Dragons - Jun 5
- Ed Sheeran - Jun 17
- Blake Shelton - Jul 10
- Jason Aldean - Jul 11
- Stevie Wonder - Jul 12
- Rush - Jul 15
- Mumford & Sons - Aug 12
- Foo Fighters - Aug 13
- Nicki Minaj - Aug 18
- Janet Jackson - Sep 2
- Shania Twain - Sep 17 & 18
- Paul Brandt & Dean Brody - Oct 2
- Kelly Clarkson - Oct 12
- Slipknot - Oct 16
- Miranda Lambert - Oct 19
- Kevin Hart - Nov 23
- The Weeknd - Nov 29
- Motley Crue - Dec 13
With two Shania shows, that's 26 concerts during the year (I don't know if Kevin Hart counts as a concert under those numbers, but I'd think it does). If the 154,183 number is accurate, that's an average of under 6,000 tickets sold per show.
I went to two of those shows -- Rush and Foo Fighters. Foo Fighters was a sellout, about 12,500 people. Rush wasn't quite a sellout, but it was still pretty full. It was definitely more than 6,000.
I can't speak on the shows I didn't attend, but if that 150,000 number is accurate, there must have been some shows that were virtually empty.