In what can be considered a truly American celebration, MLB is partnering with several drive-in theaters across the country, including one in the Chicago suburbs, for an all-day experience celebrating the United States’ 250th birthday. The league selected McHenry Outdoor Theater as one of four locations for its MLB Summer Drive-In, offering a nostalgic and unique way to celebrate America’s birthday. Festivities include a showing of “The Sandlot,…