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

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

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

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

EventHubs fighting game news and tournament results

Lost Smash Bros. Slamfest '99 Photos Put Pikachu, Mario, and Yoshi in a Real-Life Ring - IGN

Interview With a Creator of Super Smash Bros. Slamfest '99 (Lost Media) : r/ smashbros

Super Smash Bros. (video game) - Wikipedia

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

Lost Media – Page 2 – The Maurice Bear Times