পরী are attracted to laughter, that much I know. I've heard also that if আপনি walk around a suspected spot 9 times under a full moon, it could reveal a portal to their world. Also, children are আরো likely to see these little creatures, especially girls (from what I've head). This is information I already knew and some stuff I looked up earlier about fairies. Hope I helped! :)
Most পরী are wise and clever and আপনি will have trouble finding them. You'll have better luck catching pixies, who are আরো playful and silly. They're the small ones. But since পরী live in Fairyland most of the time আপনি probably won't be able to find one. Pixies are আরো likely to come to the real world, but other পরী are naturally curious and might also come her on occasion, but they'll be আরো cautious than pixies.