"Growing up, you don't really think about the Calder Cup," said Nielsen, who won the title with the AHL's Toronto Marlies last year. "But the older you get, the more years you play in the American League, you realize how prestigious of a trophy it is to win.
"When I got my day with it, I took it home.
"Back to my hometown rink.
"Back to where I got my start, to enjoy it with my family, friends, and all the people that supported me over the years.
"When I first held the trophy in my hands, I took a second and just looked at the names. You see some that are now superstars in the NHL. You realize that some guys play 10, 12 years in this league and never get a sniff.
"To win it at 21 years old, it was pretty special and getting to share that day with my friends and family, with the minor hockey association that helped get me to where I am today, it really makes you appreciate where and how far you've come.
"Turns out, I have another day to look forward to now."
At the time, the likelihood of a repeat visit less than a calendar year later seemed all but impossible.
Until a mid-season trade between the Flames and Toronto Maple Leafs changed all that, and Nielsen was headed back his home province where an annual stopover was already scheduled for the fall of 2019.
On Saturday, the wait will finally be over. Nielsen will suit up for the Flames in an all-rookie edition of the Battle of Alberta - 90 minutes north, in the city he calls home.
"As soon as that game got announced, my phone started blowing up with ticket requests and people asking if I was playing," Nielsen laughed. "It's a pretty big deal.
"Even last year, I made sure to watch that game. Then, getting traded here, it was kind of in the back of my mind all summer that I'd get a chance to play in that game, if we went back.
"When I played for Lethbridge in the WHL, there were always 30, 40 people there watching me.
"It will be cool to put on an NHL sweater, have some fun, and put on a show for the Flames brass, and all my family and friends."
The 22-year-old is one of eight defencemen and 25 total players vying for ice time during a two-game rookie showcase in hopes of extending their stay into main camp, and beyond.
Nielsen, though, is unlike any other on the roster. He's entering his fourth pro season, but has yet to make his NHL debut after being drafted by the Leafs in the third round, 65th overall, in 2015.
He's also one of the most experienced, with more than 200 AHL games under his belt, including a long, championship playoff run in 2018.
"Last year coming into camp, I kind of knew I was on the outside looking in with all the young guys they brought in," Nielsen said. "That was my first real taste of the old cliché, 'It's part of the business.' It was kind of a wake-up call being traded, and it being a situation where the other team doesn't want you anymore. To have someone show interest in you and to be told that they wanted you at the draft, but someone else picked you first - it was pretty nice to hear.
"Now it's up to me to make the most of the opportunity."