Create an illustration and poster for a small charity festival

Information for the business: UK Charity
Design details: My organisation is planning a festival highlighting the skills and crafts of older people to show a younger audience how to do things themselves. The event will take place in Hoxton Square, London and i'd like a poster to advertise the day and encourage people to attend. I was thinking of using an illustration depicting the square/buildings with stalls, bunting etc and potentially some of the crafts which will be on display. It should be fun, summery and attractive but not cheesey. We've already produced creative to recruit the participants but need something to drive awareness - i don't expect them to be similar. We have a logo which can be supplied along with examples of creative for background, as well as press release with more info.
Target audience: Mixed 20-60
Ideas for the visual style: illustration with festival theme
Where the design will be used: Print
Extra notes: I'm hoping that further work will be commissioned if a successful relationship is established as i need to extend my supplier portfolio.