IF Prince Harry is suffering from the post-holiday blues after his "working” trip to the Caribbean, well at least he is got a few events to look forward to this summer.And now he has an invite to hang out with his old mate P Diddy too.Diddy – who met the Prince and his brother William at the Diana Memorial Concert five years ago – will perform at the ‘One Love Peace’ festival in east London on July 15.The rapper said: "I really can’t wait to get to the UK as London is one of my favourite cities."I’m also hoping I’ll get to catch up with Prince Harry while I’m there. He’s such a cool guy and it’s about time we hung out. "I need him to take me to some of those wild Mayfair clubs! Those bars better stock up on anti-bacterial spray.”The Sun.