Questions On Turning Thirty-One, part II by KlionskyG

GEOGRAPHY
What river's flow is impeded by the dam named after the 31st president of the United States?

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GRAB BAG
Who was born on July 31st "as the seventh month died" in 1980? He was first mentioned in the New York Times in February 1999.

LANGUAGE
31 and 255 are both one less than a power of 2. Anagram "THIRTY-ONE" into an offer your friends might have made you -- or you might have made them -- 255 days before New Year's Eve in high school.

FOOD/DRINK
Laraha is a citrus whose dried peel is used to flavor any of a number of colorful 31% alcohol liqueurs that are named after the island on which the fruit grows. Name the island.

GAMES/SPORT
What city hosted the Games of the XXXI Olympiad? The host country's men's soccer team won its first-ever Olympic gold at these games, defeating a team that had recently knocked it out of a different competition.

GEOGRAPHY
Name any UN Member state within 200 miles of any of the following four points:
31°N 31°W
31°N 31°E
31°S 31°W
31°S 31°E

SCIENCE
Halfway through and time for tea:

Of the colors in a box of 32 Crayola crayons, which one is best represented by the hex code #313131?

POPULAR MUSIC
What actress played Alex Dupré on One Tree Hill? She released a country music album called Thirty One in 2015, which peaked at #3 on the Top Country Albums and #10 on the Billboard 200.

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BUSINESS/ECONOMICS
In November 2019, an item called 6300A made by Patek Philippe SA sold for 31 million CHF (almost 32 million USD) at a charity auction. The item is reversible, has 20 complications, and allegedly took 10,000 man-hours to produce. What is this item?

GEOGRAPHY
What country has 31 Ostanha (provinces)? The largest is Kerman and the smallest, carved out of the capital's province in 2010, is Alborz.

SCIENCE
Having nothing to do with internal anatomy, what element, with atomic number 31, is often used in LEDs and, because its melting point is around 86°F (30°C), can be an alternative to mercury in thermometers?

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GAMES/SPORT
As seen in this slightly redacted commemorative program cover, the Chicago Cubs retired uniform number 31 in honor of two different people on the same day in 2009. One #31 will be joined by Larry Walker as the only Canadians enshrined in Cooperstown, and the Hall of Fame plaque of the other #31 bears no logo. Name either player.

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MATH
Last one!
31 can be written in the form (n^k - 1) for integers n and k greater than 1.

All in one string of numerals, write out 31 (base 10) in base n and then base k.

("987654321" is one string of numerals; "9876 and 54,321" is not.)