It may be irrelevant, but besides it being Spring, Pareidolia being connected to Sensei, USER2's recent return, the Egg Time with Nao-chan, and HOPE/Yasu's god being MIA, the Mall is also still being renovated.
It's difficult to tell why there hasn't been a Happy Event in Chapter 4, but there's plenty of other things going on, and I'm not entirely sure of the purpose of Happy Events in the first place, besides lore, and maybe to influence Sensei, who's kind of just being influenced by Pareidolia, directly, now.
Maya Prime is also gone, so that may be relevant since there hasn't been one since. The "love story" being over, Sensei being the "former hero", Ami breaking, and the Shapeshifter/Himawari being somewhat missing since the Ami clones which may have appeared in the last Happy Event, may also play a factor.
That reminded me that Kaori's 'Il Cervo' Chapter 4 Event is definitely under-theorized about.
From Sensei mentioning Whales, and Cores, Ami mentioning the Moon, Deer Parts, and seemingly commanding Sensei to sit, then Kaori mentioning Wishes, Gold Stars, Faceless Elves, The Moon being in the Large Whale, and them all making a Nuclear Family, etc.
So much to wonder about.
In theory: It seems to imply that Ami plans to resurrect her mother (moon) through the memories of Sensei or whoever (whales and memories are a thing) since the moon is in the whale, but that's probably a little out there.
Considering that Sel sees Ayane like a daughter:
I have some questions, lmao.