I know that black light (UV) is often used to see the microbes (colloquially referred to as germs) on people's hands but is there any way by which we can examine the microbes on people's hands without having the surroundings be completely dark (what is required for black light to work) or using a microscope? I am trying to show a roomful of people the microbes on my hand but the surroundings aren't going to be completely dark and there is no way I can use a microscope.
Given your constraints, the only solution available would require some amount of preparation. If you are so inclined, you can purchase sterile, ready-to-use agar plates online, which you can then inoculate with microorganisms from your hands by simply touching the agar surface with your palms, and letting the plates incubate at room temperature. A day or two's time should be sufficient for plenty of microorganisms to grow, allowing you to demonstrate that your hands have "germs" (although some of the microorganisms you'll find on your agar plate may very well be airborne contaminants if you don't take some precautions).