Captain Underpants Birthday Party

Capitán Calzoncillos! Have you heard of him? I am sure that every 2nd or 3rd grader has enjoyed the colorful language of the Captain Underpants series. Because there is a limited amount of Spanish chapter books for my dual language learners, it seems that the eight books in the series are in heavy rotation in our home.
That being said...the twins want to have a Captain Underpants Birthday Party!
I love planning their birthday party.
I love coordinating party supplies, plates, utensils, napkins and decor. But this year has been a bit more challenging because there are not any licensed party supplies for Captain Underpants! So I'm sharing my finds with you all! 
Captain Underpants plush / BAM! napkins / POW! plates / Red balloons with black dots / Sour Flush candy / 12 pack of flipbooks / Temporary tattoos / Round sticker for lollipop favors / Personalized t-shirts / Buttons or Magnets (Disclosure: the above are affiliate links)
I love how this Super Hero theme from Birthday Express blends well with the Captain Underpants books! And for those familiar with them, they occasionally have fun flip-o-rama sections in the story, so I thought flip books would be great as favors! Then there is the colorful, sour potty candy I found on Amazon! Gross, I know, but it's what they want!
And I don't mind one bit, I'll do anything to keep that love of reading going!
So what do you think? Do you enjoy throwing parties? What are your 8 and 9 year olds partying too?