The jewellery brand is sponsoring the event, an all-day festival taking place in and around Brick Lane, in East London
Harriet Vine MBE and Rosie Wolfenden MBE from Tatty Devine have said, "We are big believers in the power of girls to change the world," with the festival promising a day of celebration, creation and conversation about how women can break the cycle of global poverty.
With everything from poetry performances, to WAH nails manicures and a headline performance by Jessie J, there's a lot to see.
How win one of three Tatty Devine necklaces
Simply follow us on Twitter and retweet this tweet!
To find out more information on Girl Effect Live please visit: www.girleffectlive.com.
Three winners will be announced on the 21st July, the competition closes at 9am.
This competition/promotion is in no way sponsored, endorsed or administered by, or associated with Twitter. By participating you hereby release and hold harmless Twitter from any and all liability associated with this competition/promotion. You are providing information to Hearst Magazines UK and not to Twitter.
Click here for full terms and conditions
SHARE YOUR #HANDBAGSPY PICS & WIN GOODIES
EQUAL PAY WON'T HAPPEN IN YOUR LIFETIME
MORE ON HANDBAG