IOWA CITY — If you’ve attended a Hawkeye athletic event in the last 30 years, you might consider sending Paula Jantz a thank-you note. Jantz, senior associate athletic director for sports administration and operations, has been a key part of planning Hawkeye events including games, tournaments, Olympic trials and one-of-a-kind undertakings, such as concerts and an outdoor wrestling meet at Kinnick Stadium. “For us to invite guests to our house, so to speak, is really special,” said Jantz, 62, who is retiring Feb.