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

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

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. (video game) - Wikipedia

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

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

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

Super Smash Bros News

User blog:RottenPumpkinGamesALPHA/Super Smash Bros. Intergalactic, Fantendo - Game Ideas & More

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

Smash Bros. news, videos, tournament results, streams and more

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