Harry Potter Party: pre party stress

Oliver is having a party next Saturday for his 7th birthday.  A Harry Potter party.  I feel a bit like I'm spinning my wheels with this party (and it is distracting me from my other works in progress!)  I'm trying to both make it fun, but not be over the top about it.  All Oliver wants, is to play quidditch with broom sticks.  Ben says just let the kids do their thing without any prescribed party activites.  No pressure.

There is so much Harry Potter party stuff on the web and some very over the top but cool parties.  One thing I saw which I love is where people have painted brick walls on fabric and then slit an entrance through it for the kids to enter the party through 'platform 9 3/4'.  I love this idea so bought some brick fabric on ebay the other day, only to find out that the bricks were tiny, like doll size tiny.  Not to be discouraged, I thought I'd paint some lo fi bricks onto fabric.  So today, I thought I'd make the 'brick wall'.  As we were driving around collecting supplies for the cake and different things (in a slightly stressed and erratic way) I said "Oliver Oliver, what do you think about the brick wall?"  To which he replied, "Nah, I don't want it.  Don't do it."  I replied, "But it will be so cool."  He continued to say that we didn't need it and he didn't want it until finally I listened.  Ok, so it would be really cool, but perhaps the kids can just come in through the side gate, not through a brickwall. On their broomsticks....