Of course I'm not suggesting that we eat Cambridge, but rather that we visit this show which is all about food in our lovely town. And since it's round the corner from the Rainbow Cafe, it's very easy to get to after the meetup earlier in the day.
As well as a chance to find out about exciting projects and outlets (CropShare for one), it's a chance to do a bit of demand chain activism. Letting retailers know that you're interested in vegetarian or vegan food not only gives them an economic incentive to offer ethical products, but may also be able to give them some faith in their intuitive ethical sense that they can make a fair living selling 'good' things.
It could be harmful to over-represent the vegan base in Cambridge though - if a retailer came away with the impression that he could sell 100 vegan rolls a day it would probably just end in tears. I think the good thing is to talk to people and realistically let them know your wishes and habits.
It could be fun too! There might be cakes.