I'd advise buying your tickets well in advance if you want to travel in August.
要是想在八月份去旅行，我建议及早购票。
《牛津词典》
2
You?are?advised?to?make?travel?arrangements?well?in?advance, especially when you plan to travel abroad.
建议你事先做好旅行准备，尤其是打算出国旅游的时候。
3
Another way companies are trying to lock in business is to offer discounts on advance bookings far earlier than they used to, including peak summer and fall travel periods.