A heatwave is affecting much of the United States, straining power grids and forcing disruptions to Fourth of July events, according to reports from multiple outlets. The extreme temperatures, described as record-breaking, begin in the Midwest and spread eastward earlier in the week. As temperatures rise, electricity demand increases, placing additional pressure on power systems and contributing to grid strain. The conditions also interfere with planned public activities tied to Independence Day celebrations. Outlets report that events scheduled for July 4 are disrupted as organizers respond to the heat and as conditions affect logistics and public safety planning. The reporting is consistent in describing both the geographic spread of the heat across the country and the simultaneous impacts on energy infrastructure and major holiday events. Overall, the heatwave leads to higher power usage and operational challenges, while communities across different regions adjust their plans for Fourth of July festivities due to the extreme weather.