Many new activities were added to the dorm in Persona 3 Reload including:
More social opportunities with dormmates
Watching movies on the DVD player in the lounge
Gardening on the dorm roof
Reading on the second floor
Cooking in the communal kitchen
Studying with dormmates in the dining room
Using the shared computer to improve Social Stats, Tartarus skills, secret vendor and vending machine items, and Social Link points
Walking Koromaru
When the protagonist walks Koromaru at night, either a dorm mate will go along and Koromaru will find an item, or the protagonist will encounter a Social Link and gain +15 Social Link points.
Who appears on which date are all fixed.
Date
Dorm Mate
Encounter
8/9
Kenji
8/15
Aigis
8/22
Bunkichi and Mitsuko
8/23
Akihiko
8/27
JunpeiOnly if the protagonist went to the film festival with him during the day
8/29
FuukaOnly if the protagonist went to the film festival with him during the day
8/30
MitsuruOnly if the protagonist went to the film festival with him during the day
9/6
ChihiroOnly if her Social Link isn't reversed
9/16
Shinji
9/23
Shinji
9/27
Akihiko
10/5
Aigis
10/10
Ken
10/17
Kenji
10/18
Yuko
10/24
Keisuke
10/25
MamoruIf his Social Link is maxed, then Kazushi will appear instead
10/31
Ken
11/1
YukariOnly if her Social Link isn't reversed
11/7
MamoruIf his Social Link is maxed, then Kazushi will appear instead
11/8
Yuko
11/14
ChihiroOnly if her Social Link isn't reversed
11/20
Ken
12/8
ChihiroOnly if her Social Link isn't reversed
12/19
Kenji
12/21
FuukaConversation changes if the protagonist is dating her
12/22
MitsuruConversation changes if the protagonist is dating her
12/23
YukariOnly if her Social Link isn't reversed. Conversation changes if the protagonist is dating her.
12/27
Junpei
1/2
Yuko
1/7
Aigis
1/9
ChihiroOnly if her Social Link isn't reversed
1/10
MamoruIf his Social Link is maxed, then Keisuke will appear instead
1/16
Mitsuru
1/17
YukoConversation changes if the protagonist is dating her
1/23
ChihiroOnly if her Social Link isn't reversed. Conversation changes if the protagonist is dating her.
1/24
Kenji
1/29
All of S.E.E.S.No item obtained
When the protagonist walks Koromaru with a dorm mate, then Koromaru will find an item. This item is usually random, but there are two dates where he will find a specific item.
Only if the protagonist went to the film festival with him during the day