This is either an incredibly easy or incredibly difficult square to circle, depending on the contracts signed between the broadcasters and the event organisers.
Basically: has the BBC got either Eurovision or the FA Cup Final on the basis that they must show them on BBC1?
In the past decade, the Beeb have shown the Olympics, the World Cup, the Premier League, the Six Nations, Formula 1, Wimbledon and The Open on BBC2 so I'm 99% certain that the Beeb have never signed a contract that demands coverage is on BBC1. Would seem rather pointless given how far down the EPG
you have to go to find the sports channels.
But it's not a case of whether they have to show them on BBC1, it's the fact they want to show them on BBC1.
ITV aired Junior Eurovision for the first three years with the inaugural contest screened on ITV1 (and subsequently ITV2). They were intended to host the second year in Manchester but pulled out due to poor ratings. I believe the contest was due to be hosted by Mark Durden Smith and Tara Palmer Tomkinson so we perhaps dodged a bullet there.
Yes, straight after the first series of I'm A Celebrity Durden-Smith and Palmer-Tomkinson were a regular double act on ITV as, like now, they happily gave every star of I'm A Celebrity umpteen different vehicles. In 2003 they did a proper selection show and showed the contest live on primetime Saturday night ITV, moving Pop Idol to a teatime slot for it. Durden-Smith and Palmer-Tomkinson did the commentary and were useless at it, I remember they both completely failed to work out who'd won. And it got awful ratings and was relegated to ITV2 to see out the contract.