In my experience or Freshers here at NTU (done it myself and the 2 guys I live with were head reps this year); freshers week is going out every night, getting very drunk and sleeping all day. There are arranged activities during the day time, but the only people that really went on these were international students. A typical night in freshers will begin very early, about 6 or 7pm with predrinks, getting to know people in your flat and surrounding flats. You'll all be in fancy dress as every halls have a different theme each night of freshers. Then between 8pm and 10pm your fresher reps will herd you all off to your halls' allocated club for the night, you all go out, make fools of yourselves, have a laugh, meet so many new friends then reps help you get home after, whenever you're ready to leave. No one normally wakes up until afternoon the next day when you'll normally all get together with flatmates/nearby flats again to discuss the antics of the previous night. Then when your hangover is almost gone... it's time to get dressed up and do it all again!
On move in day, it's best to arrive as early as possible, because the queue for student cards and fresher wristbands can take up to 4 hours on saturday mid-late afternoon.