I love Stan Lee pictured in the background as part of the celebration. Somehow Jack Kirby wasn't invited, despite being FF's co-creator.
In a poster Byrne did a year or so later (first as a black and white centerfold in the 1982 FANTASTIC FOUR CHRONICLES, then 2 years later released as this Marvel poster in color), Kirby is , if not visible, still given the co-credit he is due. https://lh5.googleusercontent.com/-...QQ/6kndMaUpl_o/s1600/ffpostercolor-1.jpg