Earlier this year in a conversation with Hugh from Harringay Online we were discussing how "Hyperlocal websites" could promote local shopping and Hugh told me about a way to support local businesses that that emerged in New York last Autumn. We discussed running London's first 'cash mob' in the spring - we weren't able to make it happen at the time -and it seems Hackney have now become London's first. But we still want to do something locally - Read below what Hugh has said about the idea on Harringay Online:

Not sure what a cash mob is? Many of you will have heard about 'flash mobs' - groups of people, who assemble suddenly in a place, perform an unusual and seemingly pointless act and then disperse.

A cash mob is similar. It's a group of people who pledge to buy items at a local business that could use the trade. They meet at an agreed time, spend an agreed amount and usually link a social activity for those involved, like all going for a drink, or a coffee together. The purpose is primarily to support valued local businesses and also to provide another chance for locals to meet up in a fun environment. With me so far?

There are a number of businesses that are worthy contenders to be the recipient of the first mob and after much discussion and deliberation Harringay Market has been chosen. This is a great, new friendly Market that's grabbed attention in Time Out, the Evening Standard and most recently the Daily Telegraph, (as well as from members of this site!) but it still needs to consolidate and scale up local support to ensure the various stall holders have reason to keep coming back.

Jessica, who runs it, has managed to find some truly fabulous traders for the market. There’s a terrific choice of delicious food, to eat there or take away, there are superb craft stalls and there’s plenty more besides. If you haven’t already been there, then this is a fantastic opportunity to come and support this welcome addition to Harringay. It runs from 11am-3pm every Sunday at North Harringay Primary School in Falkand Road.

I've been talking to a few locals ands there seems to be agreement that a cash mob would be a hugely positive thing for the community to do to support the market.  So on Sunday September 23rd Harringay will witness its first ever Cash Mob. And you are very much encouraged to be part of it.

To be part of the 'cash mob', you need to pledge to spend at least £10 at the market. Aim to arrive at around 1.00pm. Come with a crisp £10 note, as we’ll be taking photographs for the online sites and to cover the print side of things, we'll make sure that we get the local press involved. We'll be wanting the mob to wave notes above their heads for a true cheesy local media pic!

After the photos etc, you can enjoy a very pleasant hour or so at the market, tasting delicious food, picking up something for dinner and generally having a good time. If the weather’s good, then we’ll head to a local park after this for a picnic, so you might want to pick up some of the salad, bread or cheese while you’re there too.

We'll try and get music and entertainment for kids on the Sunday too, as we really want it to feel like a big party.

The whole point of this cash mob is to help raise the profile of the Market and to celebrate having it here and also to emphasise the strength of this community. I do hope you’ll get behind it and look forward to seeing some of you on Sunday September 23rd.

We need you to help with the marketing too! If you're on Twitter, please get tweeting about it - use the #cmobharringay tag; if you're on Facebook, tell you're friends about it, if you're on the phone, call your friends, if you're on the street, just stand up and shout!

• Show your support by signing up to the Facebook event.