There are rules nobody tells you about when you start DJing. Things you learn the hard way - or by reading an article like this one. After twenty years in the trade I am sharing the unwritten laws that separate an amateur from a professional.
Before the gig
Professionalism does not start when you step behind the decks. It starts days, sometimes weeks ahead.
DO: Communicate clearly and promptly
Answer emails within 24 hours. Be clear about your availability, your rates, and what the client can expect. Vagueness leads to disappointment - and disappointment leads to bad reviews.
DO: Send a technical rider
Even for small gigs: document what you need. This prevents surprises and shows professionalism. It does not have to be 10 pages - half a page with the basics is enough.
Minimum rider elements
- What you bring versus what you expect to be there
- Power requirements (number of sockets)
- DJ booth requirements (height, space)
- Preferred arrival time for soundcheck
DO: Prepare your music
Know your crowd. Know the event. Build playlists or crates for different scenarios. A private party calls for different preparation than a club night. Preparation is not optional - it is essential.
DON'T: Assume it will be fine
"There will be a mixer" or "they probably have CDJs" - no. Check everything. Call the venue, email the organiser, ask for photos. Assumption is the mother of all disappointment.
DO: Plan for backup
What if your laptop crashes? Your USB corrupts? Your headphones break? Professionals have backups. At minimum: a second USB with the same music, spare headphones, an emergency playlist on your phone.
Arrival and setup
DO: Arrive with time to spare
An hour before you have to start is the minimum. An hour and a half is better. You need time for soundcheck, for any problems, and for mental preparation. Turning up late is the fastest way to destroy your reputation.
"If you're on time, you're late. If you're early, you're on time." — Every successful DJ ever
DO: Be friendly to everyone
The security, the bar staff, the cleaners - everyone. Not only because it is decent, but because these people can make or break your night. A barman who warns you about a problem in the room is worth gold.
DON'T: Start straight away without a soundcheck
Take the time to test the system. Walk the room, check the balance, identify dead spots. Adjust levels before the crowd arrives. This is the moment to discover problems - not during your set.
DO: Solve problems without drama
Something goes wrong? Fine. Panic does not help. Look calmly for a solution, ask for help where you need it, and stay professional. The way you handle setbacks says more about you than when everything runs smoothly.
During the set
Here it gets serious. This is where your reputation is built or broken.
DO: Read the room constantly
This is your most important job. Watch the dancefloor. Watch the bar. Notice body language. Are people matching the energy, or standing still watching? React to what you see, not to what you had planned.
DON'T: Play for yourself
This may be the biggest mistake DJs make. You are not there to show how obscure your taste is. You are there to give the crowd a great time. Sometimes that means playing tracks you do not personally find that interesting.
The 80/20 rule
80% for the crowd, 20% for yourself. You are allowed to experiment, but the foundation has to be: what does this specific crowd want to hear at this specific moment?
DO: Handle requests professionally
Requests are part of the job. Treat them with respect, even when they are impossible. "I'll see what I can do" is better than "no." And if you play the track, thank the person - they will remember it.
That said: you are not a jukebox. You can refuse requests that do not suit the vibe or the moment. Do it politely: "That one does not fit right now, but maybe later."
DON'T: Drink alcohol during the set
This is a hard rule, especially for private parties and corporate events. One drink seems harmless, but it affects your judgement, your reaction time and your professionalism. The client is paying for a sober professional.
DON'T: Sit on your phone
You are standing in full view of the crowd. If you are constantly on your phone, you signal that you are not engaged with your work. Check your phone when you have to, but do not make a habit of it.
DO: Manage your energy across the whole set
A 4-5 hour set is a marathon, not a sprint. Build, let it drop, build again. Peak moments only have impact if there are troughs too. The best sets have a story - beginning, middle, end.
DON'T: Play too loud
Volume is not the same as energy. If the venue manager asks you to turn it down, do it. They know their room, their neighbours, their licences. Fighting the venue is a battle you always lose.
Technical professionalism
DO: Know your equipment
You should be able to work your setup blindfolded. Every button, every function. If there is a problem, you need to be able to identify and fix it fast. "I don't know how this works" is not an option.
DO: Maintain your gear
Clean faders, working headphones, tidy USB sticks. Small maintenance prevents big problems. Schedule regular time to check and service your equipment.
DO: Have an emergency plan
What if the power goes? What if the laptop crashes? What if a CDJ dies? Think about the scenarios in advance and how you would react. The best improvisation is prepared improvisation.
DON'T: Blame the equipment
"The mixer was acting up" or "this system is bad" - it may well be true, but it sounds like excuses. Professionals deliver with what they have and complain afterwards (and then only constructively).
Business conduct
DO: Have clear contracts
Everything on paper. Date, time, location, fee, cancellation terms. This protects both parties. It does not have to be legally complex - a simple confirmation email with all the details already beats nothing.
DO: Be transparent about costs
No hidden costs. If there are extras (travel, equipment, additional hours), say so up front. Surprises on the invoice are the quickest route to an unhappy client.
DON'T: Work without a deposit
For bigger gigs: ask for a deposit. It commits the client and protects you against last-minute cancellations. 50% up front is standard in the industry.
DO: Invoice professionally and quickly
Send your invoice within a week of the gig. Do not wait months. Fast, professional invoicing is part of a professional image.
Building a reputation
DO: Be reliable - always
This is the number one quality people remember. Did you arrive on time? Did you do what you promised? Were you prepared? Reliability is rarer than talent - and valued more.
DO: Ask for feedback
After every gig: ask the client how it went. It shows you care about improving and it opens the door to a review or testimonial. "How did you think it went?" is a simple question with a big impact.
DO: Handle mistakes professionally
Everyone makes mistakes. The question is how you handle them. Acknowledge it, apologise, compensate where necessary, and learn from it. Getting defensive turns a small mistake into a big problem.
DON'T: Gossip about other DJs
The DJ world is small. Talking negatively about colleagues comes back to you. Be professional, even about people you do not respect. Your reputation is not only how well you play, but how you behave.
DON'T: Complain publicly about gigs
Social media rants about bad venues, difficult clients or technical problems - keep them private. Potential clients see this and think: "Is that how they will talk about me?"
The essential mindset
All of these rules come down to one thing: professionalism is service to the client above service to your own ego.
You are not there to become famous. You are there to make somebody's event unforgettable. If you do that - consistently, reliably, with craft - the rest follows.
The best DJs I know are not the ones with the most Instagram followers. They are the ones who get asked back year after year by the same clients. Who are full of referrals. Who never have to advertise because their reputation speaks for them.
That is the goal. And it starts with following these unwritten rules.
TL;DR - the 5 core rules
- Always be on time and prepared
- Play for the crowd, not for yourself
- No alcohol while working
- Solve problems without drama
- Reliability above all
