I don't know a lot about the performers and who will attended but this is what I would like to see
Ed Sheeran X IU
Ed Sheeran X Mino
Ed Sheeran X Somi
Ed Sheeran X Rose
Itzy X Twice
Itzy X Stray Kids
Stray Kids X TXT
Gdragon/BigBang or AOA Surprise appearance (looking for shock factor like 2ne1 mama performance) 
Dreamcatcher Special Stage with band
BTS performance in chronological order from their debut song until their latest release (1 min at least for each title track mash up with perforamnce stage, I don't mind if they don't perform butter or my universe )
BTS X coldplay My universe stage
BTS X band performance
oh my girl spectacular/magical performance
Kai / EXO killer performance (maybe Kai X Jimin or Taemin or YooA dance performance)
treasure & Blackpink (will they be in mama ? I want to see them perform on mama)
I think if at least one of these happen I will enjoy mama otherwise I'll probably not enjoy it
