No video footage survived of the Slamfest '99 Super Smash Bros

The year was 1999 and recording was by no means as simplified and widespread as it is today, but Nintendo's Super Smash Bros. 64 promotional event in Las Vegas was indeed recorded, in fact, it was actually broadcasted live

Slamfest '99 aka Super Smash Bros. LIVE (lost livestream of promotional event for Nintendo 64 crossover fighting game; 1999) - The Lost Media Wiki

El Lost Media Más Extraño De Nintendo (Slamfest 99)

Slamfest '99 aka Super Smash Bros. LIVE (lost livestream of promotional event for Nintendo 64 crossover fighting game; 1999) - The Lost Media Wiki

I found photos in my old computer of the making of/rehearsals of Slamfest 99! : r/smashbros

Super Smash Bros., Smashpedia

The Lost Nintendo Event that Might Be Gone Forever - SLAMFEST '99 (Update #2)

Super Smash Bros. LIVE - The Lost Promotional Event (Slamfest '99)

New Photos from the Lost Super Smash Bros. Slamfest '99 Event Have Emerged : r/nonmurdermysteries

Images from the Smash Bros 64 event, Slamfest '99, have been uncovered

Super Smash Bros News

New Photos from the Lost Super Smash Bros. Slamfest '99 Event Have Emerged : r/nonmurdermysteries

Super Smash Bros. (video game) - Wikipedia

Slamfest '99 aka Super Smash Bros. LIVE (lost livestream of promotional event for Nintendo 64 crossover fighting game; 1999) - The Lost Media Wiki

Slamfest '99 aka Super Smash Bros. LIVE (lost livestream of promotional event for Nintendo 64 crossover fighting game; 1999) - The Lost Media Wiki

University of Indianapolis Archaeology