View Photo Gallery: The fatal shooting of Trayvon Martin, an unarmed black 17-year-old, by a neighborhood watch captain in Sanford, Fla., has led to a federal investigation, numerous rallies and a national spotlight.

Demonstrators are expected to gather in D.C. this week in rallies for Trayvon Martin, an unarmed black teenager who was fatally shot by a neighborhood watch captain in Florida last month.

The first event in Martin’s honor will be a vigil at Howard University at 7 p.m. Thursday. Participants are asked to meet at the flag pole at the campus in Northwest D.C.

The vigil will be followed by a rally in Freedom Plaza this weekend.

The “Stand Up For Trayvon Justice Rally” will be held from 2 to 4 p.m. Saturday at Freedom Plaza, 14th Street and Pennsylvania Avenue NW.

Organizers are asking participants in the rally to wear all black or a hoodie to reflect what Martin was wearing when he was shot.

George Zimmerman, 28, told police he shot 17-year-old Martin in self-defense.

Zimmerman, who grew up in Northern Virginia, has not been charged and federal authorities are now leading the investigation.

Skittles candy will be passed out at both events. Martin had reportedly purchased Skittles at a convenience store before his death.

News of the rally is being spread via Twitter, Facebook and Craigslist.