Some suggestions:
a) Travelling first class. First class or commercial
flight cabins are where socialites and attendants
looking out for their preys.
b) Wedding banquet
c) Funeral service. You don't interact with them
the way you did in b. You offer your condolence
and reminisce about the past of the dead first.
d) Sunday church. I am not kidding with this one.
I personally got to know a few who found their
SO through the church. If it is a big church you
may have to participate in smaller scale and more
intimate events like bible study groups.
I do not look for them, I strut around like a peacock and let them find me. Then it is like fishing, you keep the good ones and throw back the rest.
To reword this advice, being a wolf in sheep's clothing should
help with picking out the gullible ones and lure her to the bed.