How do you know what photographic backdrops will make eye-catching bokeh backgrounds? Your have two options, Artificial- and Natural light.
The artificial lighting technique leaves one with many options to play around with and the key here is to have a subject in focus so that your shallow depth of field will produce a bokeh effect. Be on the lookout for locations that feature a lot of lighting such as outdoor restaurants and cafés or street lights. Twinkle lights, as well as candlelight, will be your best friend in this endeavour. Remember that your camera may have trouble focusing on a subject if it’s too dark and the best way around this hurdle, is to take a torch with you (having a friend tag along as an unofficial assistant can’t hurt!) Shine your torch on your subject and let your camera focus. Once your camera has focused, switch your lens to manual, turn off your torch and snap your picture. (P.S. a smartphone’s torch will suffice too!)