A dangerous heat wave disrupts Fourth of July celebrations across much of the central and eastern United States, with officials in multiple locations canceling or postponing events. Several parades, concerts, and fireworks displays are affected as temperatures remain high and strain local conditions. In Washington, the Great American State Fair on the National Mall is among the prominent events disrupted. The fair is presented as a centerpiece of efforts by President Donald Trump to mark the country’s 250th birthday. Coverage from different outlets describes widespread impacts rather than isolated incidents, indicating that the heat wave affects plans across the region on the holiday. The reporting also links the disruption of outdoor activities to public safety concerns, and some jurisdictions adjust schedules or suspend events accordingly. While specific counts and timing vary by location, the shared picture is that the heat wave leads to significant changes to July Fourth programming, including in major venues tied to the 250th-anniversary celebrations.