Yeah, that was probably the US Festival, which like Farm Aid was an American-sponsored music fest held in the U.S.; it wasn’t the international event that Live Aid was.
CSN&Y had chart hits in the 80s and were still together at least up to then. Spandau Ballet definitely had name recognition at the time, Ultravox probably less so but still both were considered cool edgy and hip, like most New Wavish bands from the U.K. Also there was the power of music videos. I was in high school at the time and I remember the hype. I’m not saying in 1985 the Eagles or Glenn or Don H were not given any consideration (I wouldn’t know that anyway) for Live Aid but I’m pretty sure few music fans younger than 30 were giving the Eagles a second thought by then.