Founder Jonathan Downey told The Caterer the opening of Hawker Union would go ahead as planned following the company's rapid transformation of a warehouse in the former Olympia Industrial Estate.
The new site will host six street food traders and five bars in a large indoor space and yard.
The entertainment will include trampolines, pool tables and big screens, which will air World Cup matches.
This weekend the venue will be open from midday to midnight on Saturday and midday to 9pm on Sunday, with free entry.
Usual opening times will be 5pm to midnight on Fridays, midday to midnight on Saturdays and midday to 9pm on Sundays.
London Union's other Street Feast venues include Hawker House in Canada Water, Model Market in Lewisham, Dinerama in Shoreditch, Giant Robot in Canary Wharf and Public in Woolwich.