Travis Scott has announced that he will refund all ticket holders for his Astroworld festival, and has cancelled a forthcoming performance in Las Vegas.The rapper’s annual Houston festival ended in tragedy at the weekend (November 5) when a “mass-casualty” crowd crush occurred during his set, leaving at least eight people dead with hundreds more reportedly injured.In the days following the tragedy, Scott took to social media to make two separate statements: a brief, written one on Twitter and a