Rehearse so it holds up on stage

Plenty of performers rehearse a set until it is perfect in the kitchen and then lose half of it on stage. The fix is not more rehearsal. It is rehearsal that looks more like the stage.

Why does a set fall apart live when it worked at home?

At home you control everything: volume, pace, silence, the fact that nobody is watching. On stage adrenaline speeds you up, the room talks back, and lights and monitors change what you can see and hear. If rehearsal never includes any of that, you are practicing a different task from the one you will perform.

Rehearse out loud, standing, at full volume

Reading a set silently or mumbling it rehearses memory, not delivery. Delivery includes breath, volume, physical movement, and where you pause. Run the set:

Standing in the posture you will use on stage.
At the volume you will actually use with a microphone or amp.
With any props, instrument, or clicker in hand.

For bands, this means running the set as a set, with count-ins and endings, rather than practicing songs in isolation.

Short, spaced sessions beat one long cram

Research on learning consistently finds that practice spread over several sessions is retained better than the same amount of practice packed into one sitting. For a short set, three or four 20-minute run-throughs across a week will usually hold up better than two hours the night before. The distributed practice review linked below summarises that research.

Practice with a purpose

Repetition alone plateaus. Research on expert performance describes "deliberate practice": focused work on a specific weakness, with feedback, rather than simply running what you can already do. Applied to a set:

Watch or listen to your last recording.
Pick one specific problem, such as a rushed punchline or a sloppy song ending.
Rehearse only that section ten times, changing one thing.
Run the full set once to put it back in context.

Drill the things that go wrong

Live sets rarely run clean. Rehearse recoveries the same way you rehearse material.

What happens	Drill it by
You blank mid-set	Starting rehearsal from a random bit or song, not always the top
Someone heckles or talks	Having a friend interrupt you at random; respond briefly, then return
A laugh or cheer runs long	Pausing and holding until it peaks before continuing
Equipment fails	Running the next piece without the cable, pedal, or slide
You are told to cut a minute	Knowing in advance which piece you would drop

Keep a short written run order

Most performers keep a few keywords per bit or the song titles on a small card or set list taped down where they can see it. Keep it to one word per piece in large print. Write down the piece you will cut if time runs short.

Do a final timed run

The day before, do one timed, full-volume run-through of the whole set, including transitions. Enter each piece's time into the set-time calculator with a buffer for audience response, and check you are still under your slot. If you are not, decide now what to cut instead of on stage.

Limitations

The research linked here studies learning and practice in general, not stand-up or band performance specifically. The stage drills are common performance practice rather than tested protocols. For handling the gaps between pieces, see Kill dead air.