Do I cosplay for the upcoming undertale concert?

I plan to do a mettaton cosplay for the upcoming convention, I already started the patter of the sort of belt he has but now ill need more money to create the next parts... I think ill just draw more comms so I get the money to end it anyway. 

The thing is do I wear the cosplay to the undertale concert ? I dunno... maybe if i finish it fast enough, OR I could cosplay frisk or asriel or chara and Ill force my mom to be toriel since she is coming with me ? I think shell say yes because shell be happy to sahre something with me.