Marketing workshops any ideas?

[Vintage Amours]

Hey guys we have a charity millinery workshop coming up and its really well priced

theres 9 places left and we're doing a limited time deal we have 5 places for £30 instead of £38.
For every place booked we give £7 to cancer research uk

all the materials are included and theres a free cocktail

but we've only had one booking and we're running out of time its on the 31st march any suggestions

we've tried
twitter
crafts
ooh.com
makeitshareit
ideastap
gumtree
graigs list
numerous blogs have written about us
where can we go.com

tried contacting mags etc got no response

any other ideas?