It's your job to make sure there are no awkward silences in the first place.
If there is that initial attraction, and you have inner game, you should be confident enough to carry out great conversation.
How much time did you spend talking to this person, and how often do you talk to this person? Remember to keep contact short yet memorable, that is the key. If you spend too much time with an individual, you will run out of things to say!
You're an interesting person (hopefully), and if you aren't, make your life interesting! As a DJ, you should have many extra curricular activities you do in your spare time (basketball, soccer, anything!) Remember, the girl(s) you talk to are NOT your life, they are a part of your life.
By having more extra curricular activities and always going out with different groups of friends, you should have many interesting and memorable stories to share.
So there is no real answer to "what do you once an awkward silence occurs." You need to avoid that from happening in the first place, because the moment it happens, interest level will decrease in the girl you are trying to close. Close when interest level is HIGH, not when you run out of things to say.
You want it so that the moment you close, she is still interested to talk to you! Use a time restraint. If you don't know what that is, search it up, TONS of examples on this site. To name a quick one that I use: "Hey listen, I actually gotta get back to some friends, we'll talk later" Grab her #, or anything. As long as interest level is high, she will rush to talk to you the next time you make contact with her (whether it be in person or on the phone.)
If you close when interest level is low, attraction will be low. And the next time you try to make contact with her, she won't care.
Hope I helped you out.