You are showing up to play, and that’s all that counts, that’s the important part.
My main recommendations would be, do what you have FUN doing. For example, If that’s just playing one delay knob, do just that.
Stress can be unavoidable prior to the gig. Planning, preparing etc. So choose to do something that’s easy and fun. Don’t over complicate it to where you are stressed setting up and performing. Make it easy and fun so you can finally relax once the show is underway.
Same for something visual, make it easy and fun, nothing that can add stress.
Definitely don’t think much about how others will respond. Only focus on how you will respond.