I'm so sorry to hear that. ; n; I'd hate it so much if I accidentally TT'd someone out. ; nnn;
The TTing when there are events is a safety precaution. Before events, it tends to be way harder to get villagers to talk about who's planning on moving because they will talk about the event instead. During events like the Festivale or Fishing Tourney they won't be able to ping you about moving out specifically because they are programmed to do something else that day (like dancing around and giving you feathers or walking around holding their fishing rods talking about fish).
To avoid this kind of problem, just TT backwards to a time when there are no events and start from there. TT-ing backwards is safer than forward, as you can TT back as long as you want and it will count as only one day. A one week window of no events is ideal. When villagers talk about there not being events in the near future, then you're in the safe zone. If you're getting close to an event that villagers are talking about it, just TT back again.
And remember: ALWAYS COUNT THE DAYS WHEN YOU'VE LAST MOVED OUT SOMEONE/REJECTED SOMEONE FROM MOVING OUT. Villagers will start pinging to move out 5 days afterwards. Don't lose count. Seriously, I lost count once and every day I TT I'm afraid I missed my pinging me and he's gonna be moving out or something. i'm too attached
I hope I helped. ; w;