Sunday is the 25th World AIDS Day. It's held every Dec. 1 to support those living with HIV and remember those who've died.
HIV/AIDS is treatable. But groups such as the AIDS Research Alliance still search for a cure.
Actor LeVar Burton is a spokesman for the nonprofit.
"There's a lot of unprotected sex going on out there," said "Star Trek: The Next Generation" actor LeVar Burton, spokesman for the nonprofit. "You know that as well as I do. And so that indicates there is some amnesia happening, and so it's important to remember we have not solved this yet."
Free events are planned for World AIDS Day through the evening in Southern California. That includes a candlelight vigil Sunday night at West Hollywood Park to remember those who have lost their fight with HIV/AIDS. It starts at 5:30 p.m. Candles and holders will be provided by AIDS/LifeCycle.