Kagehina:

They went to a convenience store and got a bunch of snacks and ate them in a parking lot while playing volleyball

Bokuaka:

Bokuto took Akaashi to a restaurant and acted like a true gentleman (IDK I feel like Bokuto would try to impress Akaashi)

Iwaoi:

Both of them went to the lake and had ice cream before they went home

Kuroken:

Kuroo took Kemma to an arcade and won him a stuffed animal

Daisuga:

They went to see a volleyball match, nothing else they just had fun together 

Tsukiyama:

Tsuki took Yams to the movies