The first thing you have to do is make sure it's Summertime. Is it? Good! Now make sure it's nighttime. Go get a small flashlight, and take it out to your backyard or anywhere else there is grass or a lawn.
You should see a small yellow flash every once in awhile over the area if there are any fireflies around. Now don't worry. Fireflies are harmless. The flashes you see are male fireflies looking for a female companion. What you are going to do is trick the males into thinking you are a female firefly. No, not with a female firefly suit. With your flashlight!
Hold your flashlight on the ground and quickly turn it on and then off every two to five seconds or so. It doesn't have to be accurate. Experiment with your timing to see what works the best. If you're lucky a male or two, or even four or five will come over to check out the flashing.
Then you'll get to watch the male fireflies up-close. Hopefully they will perform for your flashlight as if it were a female firefly. Now go ahead, give it a try!