We hope the weather will be glorious, in which case seek out this floral scene in St James Park (by mrdamcgowan)
Saturday: Follow the Jack-in-the-Green around the City and Borough with a few pub stops along the way.
Camley Street Natural Park hosts Food Junctions festival within a festival with free breakfast and lots of activities about food and culture. Between 11am - 6.30pm.
Residents of Camberwell and Peckham take to the streets this Saturday to demand a fairer voting system, illustrating their case with giant Pie Chart Cakes on Camberwell Green with Power2010. Cakes cut at 1pm.
Be at the launch of Martin Creed's Work No. 409 which is the centrepiece of the Southbank Centre's Chorus Festival. 2pm, the Clore Ballroom, free.
Sunday: It's Scruffs dog show from 12.30pm on Highbury Fields today.
Choir fans treat yourself to free concerts from a range of choirs all afternoon in the Clore Ballroom at the Royal Festival Hall
And Food Junctions Day 2 at Camley Street Natural Park promises lots more food and fun for free.
My Beautiful Laundrette (15) screens for free at Museum of London from 2-3.45pm.
Bank Holiday Monday: The Great London Garden Trail lets you snoop around 10 designer gardens for free today.
The Purcell Room is open all afternoon for a free preview of the London Festival of Contemporary Church Music.
COPArt Live! is a free event that will mix art and music at the Village Underground in Shoreditch from 10:30am to 9:00pm.
What did we miss? What do you know? Share cheap and free fun with us by leaving a comment, tweeting @londonist #lotc or emailing email@example.com