Hollywood loves a happy ending and Project ALS needs one. With that goal in mind, celebrities, execs and a handful of stars from the medical field gathered at the Disney lot to celebrate the still-new charity’s achievements so far.

Valerie Estess touted the accomplishments of the organization she set up with her sisters Meredith and Jenifer after the latter was diagnosed with amyotrophic lateral sclerosis, also known as Lou Gehrig’s disease. Jenifer died in December.

The centerpiece of Thursday evening’s fundraiser was a screening of HBO’s documentary “Three Sisters: Searching for a Cure,” about the Estess sisters, introduced by the pic’s exec producer, Brad Grey. One-time oncology nurse Bonnie Hunt spoke, as did Disney’s Bob Iger, who paid tribute to Disney exec Harry Grossman, who is battling the disease. A perf by Lionel Richie ended the evening.