Sounds like more of a nod to the recognition of the Twitter and Facebook trend of "Throwback Thursdays" and trying to relate to that audience.
Without retro jerseys around, the Flames do have almost 35 years of archive footage they could dip into for between whistle segments, that they currently crank out on the one or two "Retro" nights per season; that's probably about as far as its going to go, I would doubt they'd go back to concession pricing.
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