I did on on-line NY Times search, Colin. Izzy's bout Dec. 15, 1927 in NY is confirmed. His previous bout, Nov. 9 vs. Wee Willie Dabies occurred not in Hollywood, CA, but at the Pioneer A.C. in New York. Further, his Sept. 12 bout with Kelly also was not held in Hollywood, but at the Dexter Park Arena in NY. I wasn't able to confirm the existence of August 26 Davies bout in Hollywood, but Izzy did fight Chuck Hellman June 6 at Dexter Park Arena.
I've added the other bouts on these cards.
Feel free to go to the library to confirm my work, Colin.
E-mail me and I'll be happy to e-mail sample articles in Adobe Acrobat pdf format to you.
Edit: One problem: we have Frankie Genaro ND with Joey Eulo Sept. 12 @ New Jersey, but the NY Times says Genaro W-10 Eddie Flank @ St. Nicks: "The spectators booed the fight from the first round to the last, and many left their seats to go home during its progess." This was the beginning of a flyweight elimination tournament to determine a successor to LaBarba. But Alex Burlie failed to appear, and Joie Ross came in overweight. Burlie was to have met Parra, and Ross to have fought Rodriquez.