As far as I can tell there are no known prints of that first Telethon. Not surprising. However, it's possible that there are several snippets scattered around like Dean and Jerry's 12 minute appearance that Lewis saved.
Cast: Bob Hope & Bing Crosby (Hosts) Spike Jones & His Orchestra
Frank Sinatra
Rosemary Clooney
Dean and Jerry
Moe , Larry and Shemp Abbott and Costello
Johnny Weismuller
Humphrey Bogart
Marilyn Monroe
Burns and Allen
June Allyson
Eddie "Rochester" Anderson
Joan Crawford
Tony Curtis
Janet Leigh
Zsa Zsa Gabor
Edgar Bergen & Charlie Mc Carthy
Tex Ritter
Edward G. Robinson
Fred MacMurray
Ed Sullivan
It appears that first telethon was short on performance guests, heavy on actors, and one TV personality/columnist in Sullivan. Here's the only known excerpt: