How to set an alarm on the iPhone for a certian day?

I have an iPhone 4 and I wanted to make an alarm for the 11th (it's the 8th) so I can remember to buy a ticket to this concert I wanted to go to before it sells out. My memory is awful so I was hoping there was a way I could do this.

Yeah, there's! Go on your calendar, then press the day you want to add an alarm to. In the top right corner, it has a plus sign; click on it. There, you can add the event name, the time, etc. Keep scrolling and you'll see 'alerts'. Click that and choose when you want it to remind you; an hour before, 2 hours, a day before, etc. Hope this helps!

Yes. Go onto the calendar. Add the event (set the start time as the time you want the alarm to sound), and activate an alarm.

As it's the 8th, if you have iOS 6, then you can go onto Clock/Alarms and just set an alarm for Friday.