The invitation says guests should arrive between 7:30 and 7:45, but our experience is that there are always a few who like to arrive early, so we'll expect the first people at 7:15.

邀请函上写着客人们应在7:30至7:45到场，但根据我们的经验，总会有些人喜欢提前到场，所以我们预计7:15就会陆续有人来了。