50501 (short for “50 protests, 50 states, 1 movement”) is an American progressivist grassroots political organization founded to protest the policies and actions of the second Donald Trump administration in the United States.
From wikipedia
The parade I assume is in reference to the birthday military parade for the 250th Army Anniversary of June 14, 2025. More here: wikipedia
You can leak memory in perfectly safe Rust, because it is not a bug per se, an example is by using Box::leak
Preventing memory leaks was never in the intentions of Rust. What it tries to safeguard you from are Memory Safety bugs like the infamous and common double free.