Since you’ve lugged it there, you might as well use your spare amp (you do bring a spare, right?) to improve your presence.

Combine two different-sounding amps and tweak their EQs for massive mongrelised tonal nirvana (Fender cleans, Marshall drive for example); or for a wide-seeming sound, use two similar-sounding amps for stereo effects like a Lesley simulator or ping-pong delay (bearing in mind that, unless they’re miked and panned hard, you’ll need plenty of space between them).

There are many ABY boxes on the market that allow you to split your signal, such as the Morley ABY, or Radial’s Tonebone Bigshot or high-end Switchbone. If you just want to run two amps simultaneously then check your existing stompboxes, one of them may have stereo outputs.