How to create an ad hoc Wi-Fi network in OS X? I came across a problem today  when there was a speaker in my class. The speaker was from the industry and had a company provided laptop which was not able to get connected to University network (some other problem which I had to raise in another question). 

As a solution to the problem, I thought I would create the public Wi-Fi,
using my MacBook Pro, without a password so that he can get connected
directly. However I am a little embarrassed in not finding a option do so. Can anyone give me some solution if one exists.
A solution does in fact exist. Click the Wi-Fi symbol in the menu bar and choose Create Network.