Among the artifacts are copies of the Declaration of Independence and U.S. Constitution, as well as a cannonball.

Philadelphia Mayor Cherelle Parker, officials from the Mexican Consulate and community members held a memorial service near the site of the crash on Saturday night.

Tens of thousands are expected to be at Gobbler’s Knob in Pennsylvania for the event shortly after sunrise Monday.

Congress has passed half this year’s funding bills, and that means several important federal agencies and programs continue to operate.