I have a couple of kids in my class that are in a similar situation as your LF in regards to Father's Day @CheerBear It is super tough for them around that time but I have taken each one aside and discussed what they would like to do instead of Father's Day activities. It was a really good conversation to have with them privately - as much for them to know I have thought of them and their situations as it was to get their ideas to help them through it too. Maybe you could approach the kids teachers and ask for something similar to help your LF deal with it better.
You are so much an integral part of what makes this community so welcoming and caring CB and I have no doubt that every one of us here are sitting right beside you throughout this difficult period for you. Anytime you need to vent - or even vent and run - you are being listened to and supported - hold onto that love and know we are here with you 