It is not really a big deal if you respect all the rules and regulations issued by the country with respect to airshows and you have a briefing with the airshow's direction. I am sure you do not need these suggestions but if it is your first time, take (very) high margins, plan completely your low pass meaning height, configuration and speed you will fly inside the display. If you are not a test or demo pilot I think that a green dot low pass at 1000 ft AGL along the display line will be more than enough. Anyway I have never done an airshow on a commercial liner so don't take these figures for granted.
Cheers.