@RaraRachael you can definitely still queue on the day for a grounds pass, I used to do it every year but now have young children which makes it a bit more difficult. The people who are camping out overnight or turning up at 5am are trying to get tickets for the show courts. We usually got there around 8am and we always got in. Some people also go in the afternoon when you can get tickets as other people start to leave. It’s best to go in the first few days though as there are more matches on the outer courts - although this year with all the rain delays it’s a bit different! Also, once you get in you can buy return tickets to the show courts later in the day which are a massive bargain - not sure how much they are now but I remember paying about £10 for centre court!