Hi hooked,
dont let this discourage you, i find that places that are commmercial like starbucks are good for readings (i do my tarot circle there) but not for finding someone to read for.
i think this is because its like the tube/subway people dont go there to chat they go there for their own space.
try somewhere more independent, a little deli, or a cafe because people tend to worry about bothering you in starbucks.
I am also organising a lunch at my house with some other readers, we are bring our friends who are not scared by tarot. we will be reading for each others friends, then feeding them as a thank you!
good luck