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

BIG Update on Lost SMASH BROS IRL Event! (Slamfest '99 Pics)

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

Super Smash Bros. - Super Mario Wiki, the Mario encyclopedia

Super Smash Bros News

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

Video Games – The Maurice Bear Times

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

Super Smash Bros. (1999) - MobyGames

Super Smash Bros. (1999) - MobyGames

Super Smash Bros: Most Up-to-Date Encyclopedia, News & Reviews

What Was Slamfest 99 - LOST LIVE STREAM OF EVENT (1999) - LostMediaJunkie