Well, the departure date is close. In general, airlines assume you are less flexible when you buy tickets close to your departure date. Those who are less flexible are usually willing to pay more.
I don't know if there is something going on that weekend or not. And that could be specific to the cities you are flying from and to. But, if you can find lower fare for an earlier departure date, there probably is.
On the other hand, when departure dates get even closer, if the aircraft is not nearly full, the airlines will offer discounts to try to fill the seats. The airlines might not offer these directly, but use a broker instead. There are websites that can help you find these deals.
Most people who fly for business (work, job) fly on weekdays, so they can have the weekends at home. These passengers generally have the companies they work for paying for their tickets. So, airfare tends to be higher for round trips that take place during the week.
Tip: Try to get your return trip on Sunday. If you have a "Saturday night stay over" , the airlines will assume you are leisure traveler. You are more likely to be find a better price.
It's also summer. More people travel for vacation during the summer, when school is out, and it's easier for families to get together. So, airfare tends to be higher in the summer.