It’s every committed charity shop trawler’s dream: Unearthing a long-lost piece of treasure with a thousand stories to tell. But Rumble In The Jumble is a charity shop and jumble sale hybrid amped up to eleven. For one day a year, you can delve into an entire warehouse full of celebrity clobber up for grabs. Over the years, the baby blue suit tempting everyone's inner rocket man was actually owned by Sir Elton John. The 1980’s throwback shell jacket slung over someone's shoulder used to call Yannis from Foals its owner, and yes, that was the dress Beth Ditto used to party in.

It’s all thanks to a flash of inspiration BBC Radio 1’s Gemma Cairney, Dawn O’Porter and Caroline Flack had at an Oxfam event a few years ago: Getting hold of some celebrity clobber that’s sold for a great cause. To date, RITJ has now raised over £60,000 towards empowering women’s lives from the Democratic Republic of the Congo to Myanmar. Now back for its fifth year of incredible bargains, music memorabilia and signed merchandise, RITJ will be taking over Bethnal Green’s Oval Space on Saturday 14th May, with a donation list that reads more like a dream-team festival line-up. You can expect to be rummaging through Kate Moss, Annie Lennox and Keira Knightley’s old favourites, alongside donations from Stormzy, All Saints, Hot Chip, Jameela Jamil and Bat For Lashes. All the while Smashbox and Bumble and Bumble dish out hair and makeup sessions, Drink, Shop, Do handle the sugar highs and Joe's Tea Co. keep everyone suitably caffeinated.

Rumble In The Jumble isn't just about furnishing a load of beady-eyed jumblers with some killer wardrobe pieces and an ace story to tell. Having enlisted the help of Oxfam and The Music Circle, the day now combines the talents of a number of rad women working to close the gender gap both in the UK and in developing countries. With Gemma, the nation’s unofficial BFF, and The Guardian Guide deputy editor Kate Hutchinson, who also works as managing director of The Music Circle, it’s truly a day to celebrate girl power in action. From one bright-spark idea at a charity event turned into a mammoth day-long affair, RITJ is about raising thousands of pounds to make a long-lasting change to gender equality. And finding 2016's answer to the Elton John suit.

We caught up with Gemma just before the jumble madness sets in to find out what she loves about running RITJ, and some of her favourite donations over the past five years.

Run Riot: Happy five year anniversary for Rumble In The Jumble! Could you tell us about what’s happening this year?

Gemma Cairney: The Music Circle is a subsidiary of Annie Lennox’s The Circle: a group of women in the music industry working with Oxfam to fight poverty and inequality. I am an Oxfam ambassador and have been working with The Music Circle for four years now on Rumble In The Jumble. This year we are raising money to empower the women of Myanmar specifically.

After a lifetime of military control, in Myanmar’s towns and villages fewer than one in a thousand leaders and administrators are women. The 2015 elections brought some change: More than 2,000 women and men have worked to increase women’s stay at home and in parliament. Continued support is vital, in August of last year landslides and flooding brought more hardship to Myanmar - The Music Circle has committed to raising a minimum of £50,000. In the same way we did for Women of the Democratic Republic of The Congo from 2011-2014.

RR: What do you love most about running the day?

GC: The old school-ness and community that a jumble sale of any sort carries with it, runs throughout the core of what Rumble In The Jumble is. Everyone pitching in! Everyone rooting amongst bric-a-brac and bargains, the stall banter and the snacks. I truly love jumble day. The fact that everyone works so hard, volunteers their time and it's all for a thoroughly thought through and worthy cause makes it magic.

RR: The Music Circle has been working with you on the jumble since 2013. Since then we’ve really seen the conversation around feminism, girl power and supporting women in business come to the fore. What has the support of The Music Circle meant for RITJ?

GC: Rumble In The Jumble had happened once when The Music Circle got on board. It was an idea Dawn O' Porter, Caroline Flack and I, had at an Oxfam initiative, that was about empowering women around the world. We thought about how much free stuff famous people get sent, how many clothes celebrities generally get through because of their jobs and decided on the spot that there would be no better use for it, but to put it all in a giant jumble sale. We did it in a church hall in Kings Cross, organised it in three weeks and raised over £7K. People were queuing around the door, and we were struck by the sheer buzz.

The following year, Dawn had moved Stateside, and The Music Circle were keen to try and get involved to generate an injection of funds for The Music Circle's goal. The collaboration instantly worked - It brought RITJ to a different level, it meant more hands on deck for starters [and] every single member of The Music Circle astounds me. They are a supremely smart, well connected, hardcore working women in the music industry. They have been able to specifically bring an element of 'music' to the event.

Now we still have brilliant high profile people's jumble, but we also have banging DJs playing records whilst we shop. We also have a vinyl stall for more music specialist jumble. Now you can come to RITJ and buy Kate Moss's togs as well as Andy Weatherall's record box. The offering is fabulously diverse and we are all so proud of it. Caroline still has a stall every year and sells like no other!

RR: On the morning of the jumble, what do you wake up most excited by?

GC: I'm not sure excitement is the right word. As I'm often nervous! But I guess that's a symptom of the right kind of excitement.

RR: What’s the best thing you’ve ever grabbed? And what's the weirdest thing you've seen donated?

GC: One year I excitedly bought a golden sequin beret with a giant bow on it, that Bat For Lashes had worn to the Brit Awards, and Claudia Winkleman's waterproof eyeliner from the Smashbox stall. I've donated all sorts of stuff that hasn't fitted me since my twenties, which means loads of teeny weeny, body-con dressed in weird 70s prints.

RR: Do you develop ‘jumble vision’ the rest of the year around? Do you go to friends' houses and start insisting they donate things?

GC: Pretty much yes. I definitely annoy people by messaging them asking them to stuff a bin liner.

RR: And finally, what are your three top tips for getting the best out of Rumble in the Jumble?

GC: One, relax, don't get shopping-fret where you're worried you'll miss out on the best stuff. We stagger putting out the best stuff. Two, seek out Jez' meatballs. I won't say anymore... Just trust me, you won't regret it. Three, go to the afterparty at the Sebright Arms down the road - there will be lots of gorgeous stall holders ready for a good dance.

Gemma Cairney and The Music Circle's Rumble In The Jumble takes place at Oval Space, Bethnal Green, E2, on Saturday 14th May from 12pm-6pm. Full details here, and more information on The Music Circle here. Gemma Cairney's website is here and you can tweet her at @gemcairn