Though I understand your reasoning its still your fault. Why are you hoarding stuff so much like a hamster that you have zero empty space left is beyond my comprehension - and knowing that, while still refusing to expand inventory. Yes hoarding stuff for future girls I get it, but srsly part of the plan needs to be a contingency plan as well. Always keep some free space. Or just splurge some FGems and expand.
I have around 330 Inventory space, and I have bought ZERO FGems over the course of the game. Its an investment. People who are cheap with their investment will regret it sooner than later - hence this case.

Thats piss poor planning and management on your part, no matter how you look at it. You have no one else to blame for it, for by now you should know how things work (or dont) with events, and there is always a possible margin of error that one has to account for at all times.