Liam Gallagher could sell out Knebworth on his own, 25 years after Oasis’ massive concerts at the venue.The Manchester band performed to 250,000 fans over two nights at the Hertfordshire venue in August 1996.McGee – who signed Oasis to his label Creation Records, kickstarting their ascent to fame – is now estimating that Gallagher could sell out a solo show there.