Nebraska City is celebrating America's 250th birthday in a way only the home of Arbor Day could, with its annual Treestock festival.Since 2021, Treestock has attracted thousands of visitors from across southeast Nebraska with live music and overall Independence Day festivities.Unlike its 1960s musical name inspiration, Woodstock, Treestock is a family-friendly event with something for everyone. Amy Allgood, executive director at Nebraska City To…