Muiyin, don't worry about your cruise in July. The Star's first Alaska cruise (and also the Sun's first Alaska cruise, which I was on) were always scheduled to begin later than any of their other cruises for the season (leaving Seattle at 10:00 p.m.). Both ships had repositioned from their winter cruises and arrived in Vancouver on the morning of the day they were to leave Seattle. When all passengers were disembarked in Vancouver, both ships were refueled and loaded with provisions for their Alaska cruises. Then the ships sailed empty of passengers from Vancouver to Seattle, a trip of several hours. Each ship arrived in Seattle around 6:00 p.m.
Except for that ONE and only one cruise, both ships are sailing their normal schedules and leaving Seattle at 4:00 p.m.
Have fun. You will love the Star. She is a beautiful ship!