The article is entitled: "20 Ways To Make Cash From Your Audio Gear & Skills". The article features numerous industry professionals providing us with their input on the subject.
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Within the article, audio professional Mike Thornton provides a point-form list of good practices for all freelancer technicians just like me. See below:
As for me personally, I have made some extra cash doing freelance sound work on fashions shows. The director of the fashion show wanted someone to handle all the sound related jobs so that she could concentrate of running the show itself. I did music playback for all the fashion sets and I also mixed sound for a solo acoustic artist playing acoustic guitar before the show and during the intermission.
Coming up, I will be mixing sound for a wedding ceremony for some friends who have hired me to be sound technician/DJ for their big day. Along with the music playback, I will also be mixing a vocalist singing one song with backing tracks. With the ceremony, dinner/reception and dance/party happening all inside the same venue, I am going to be busy making sure everything goes off without a hitch.
Cheers from Soundtechguy!