Concert/Ticket/Seat Protocol ..???

[DownOnRodeo]

I've just got my step-mother a ticket to the sold-out 19 Feb concert in Brisbane that me, my dad and a fan from Burnish have front row for.

Could some kind souls please look at thtis map of the venue and help me with a question. The map is here.

Our seats are front row in s47. The ticket I got for my stepmother is s17. As you can see, both sections are the same platinum price ($A206), but totally different areas. How does ticket checking work? If Lux (from Burnish) and I are standing up from the word go, do you reckon Diane could easily sneak in with our group and not be told to go back to the wastelands of s17?? Thanks for any ideas you can offer.