Short answers, pulled from the story.
Wrigley Field opened on the 23rd of April 1914, as Weeghman Park. Baseball executive Charles Weeghman hired architect Zachary Taylor Davis to design it as a home for the Chicago Whales of the Federal League. The Chicago Cubs first played there on the 20th of April 1916.
The nickname "The Friendly Confines" was popularized by Ernie Banks, the Hall of Fame shortstop and first baseman who spent his career with the Cubs. The phrase became closely associated with Banks and has been used to describe the park for decades.
The ivy was planted in 1937 by Bill Veeck, who was inspired by plantings he had seen at Perry Stadium in Indianapolis. The original English ivy was later replaced with Boston ivy, also called Japanese ivy, which better withstands Chicago winters.
The Cubs resisted lights for decades, including a 1942 plan that was abandoned when the equipment was diverted for the World War II effort. Permanent lights were finally installed in 1988, after Major League Baseball threatened to bar Wrigley from hosting postseason games without them. The first official night game was played the evening of the 9th of August 1988, with the Cubs defeating the New York Mets 6-4.
A 2004 agreement required rooftop owners to pay the Cubs 17% of their gross revenues in a lease lasting until 2023. When renovation plans threatened rooftop sightlines, the Ricketts family began purchasing the buildings outright. By the end of the 2016 season, they had acquired ten of the rooftop locations and held a financial stake in an eleventh.
Wrigley Field currently seats 41,649 people, a capacity that has been in place since 2017. The park was designated a National Historic Landmark in 2020.