As a party is a huge thing to set up and very costly, why not consider printing some cheap leaflets/having some cardboard charity boxes and having an international life extension coffee morning? I don't know how many would turn up for such a thing, as we're not as well known as Macmillan Cancer who have a similar strategy but it's something to consider. Would be especially good if we had someone who worked in a cafe and/or another public service or place where there will be a constant influx of people and they will see and potentially partake.
Also, what about some of those rubber charity wristbands that are popular these days? I'm guessing they're cheaper than pin badges.