To find the total number of visitors during the first two weeks of summer, we first determine the number of visitors in the second week.
The number of visitors during the first week is 2,308.
During the second week, the number of visitors is: 2,308 + 3,089 = 5,397.
Now, we can find the total number of visitors for both weeks: 2,308 (first week) + 5,397 (second week) = 7,705.
Therefore, the total number of visitors during the first two weeks of summer is 7,705 visitors.