KIM'S BIRTHDAY

It's June, and our son Kim is gonna be turning 5. I wanna make this year memorable, as I wasn't much around last year and couldn't host a party for him. He is currently into Batman and angry birds (all superheroes characters), so I am gonna be using these themes for the birthday. 
So far, I have managed to finish preparing the online invitations, and Kim will help me with the 'snail mail' ones. I am really excited, though we have no date fixed yet. His birthday is on the 17th, but since it's a weekday, we will shift it to a weekend, either the following or the next.

I am still looking for ideas for making the cake. I suck at cake making, but wanna do it!! I know, not a good idea, will try though, otherwise run to a shop in the last minute...lol, just kidding. So here is the card.