Sunday, 03 August 1986
Beach Scene Festival
San Pedro
Los Angeles, CA, USA
with Sparks, Perri, the Rave-ups, Blow-up, Firehose, Fishbone, Zerimar, Danny Wilde, Fortune, Dexter, the Mutts and Korean singer Mary D.
[No setlist details]
Faith No More definitely played, but have been unable to confirm date played, could be 2nd or 3rd of August. Saturday seems most likely.

Los Angeles Times, 10 August 1986, page 74
Full page ad thanking bands for performing, lists Faith No More

Google news archive search 1986 has article from "Daily News of Los Angeles" (Jul 31, 1986) listing Faith No More among artists playing at the First Annual Beach Scene Festival on Saturday and Sunday (2nd and 3rd August).

Sparks bootleg (Halfnelson Demos) exists from Sparks gig at First Annual Beach Scene Festival on 3rd August 1986.

Reviews of the gig from Los Angeles Times don't mention Faith No More.

LA Weekly, 1-7 August 1986, page 80 - 3pm, $5 - lists Faith No More as play on 3rd August at and "All day event" with Lions and Ghosts, 15 Minutes, The Afro Sisters, Stupor, Soave Bolla, Sean de Lear and the Fixtures, Trisez, The Butchers and Glen Meadmore: None of whom are listed in the list of performers for "Beach Scene Festival".
Full list of performers:
Andy Taylor, Animotion, Art Of Noise, Belinda Carlisle, Blood On The Saddle, Bluesbusters, Danny Wilde, Device, Dexter, El Debarge, Euphoria, Faith No More, Fire On Blonde, Firehose, Fishbone, Fortune, The Halibutes, Honeymoon Suite, Icehouse, Isle Of Man, Jan & Dean, Jeff Scott, Jermaine Stewart, Kalapana, L.A. Dream Team, Level 42, Lil' Elmo & The Cosmos, Long Ryders, Messenger, Missing Persons, The Mutts, Nu Shooz, Pancho Sanchez, The Pandoras, Peggy Gilbert And The Dixie Bells, Perri, Preston Smith, The Rave Ups, Secret Spots, S.O.S. Band, Sparks, Stacey Q, Tease, War, Wing Tips, Wishful Thinking, Venice, Zerimar
On This Day:
Year Venue State/Country
1990 The Venue, Dee Why NSW, Australia