The event organiser Page says:

I have seen first hand the terrific things that the organization does for our “guests” by providing free food, clothing and community to London’s homeless and marginally homeless on a daily basis.  In an effort to further support this wonderful organisation, we are holding a “Pop Up” 4th of July Celebration Dinner and Pub Quiz at the Church on Wednesday 3 July to raise additional funds for this worthy cause.  

More info at: www.amchurch.co.uk/soup_kitchen.htm