If you are in a place without a WiFi network to join such as a venue or practice space, you can create an ad-hoc WiFi network on your computer that your iPad can join.
These instructions are Mac-specific. If you have a Windows machine and can contribute instructions, please let me know.
(originally from this post on Mac StackExchage.)
Run the following commands, one-by-one in Terminal:
sudo networksetup -createnetworkservice AdHoc lo0
sudo networksetup -setmanual AdHoc 192.168.1.88 255.255.255.255
sudo networksetup -setmanual AdHoc 127.0.0.1 255.255.255.255
Configure sharing settings:
Join the WiFi network you just created on your iPad
Tap the (i) icon next to the WiFi connection on your iPad and note the iPad's IP address. In the screenshot below, it is 192.168.2.4
Add Knobbler to your Live Set and manually fill in the iPad's IP address.
Open the Knobbler app on the iPad and go to the Setup page. It should scan for and detect the device on the Mac.
Select your Mac in the "Found These Knobblers" section. You should get a "Connection Successful!" message.