Hi, I've been using Lightroom for many years. I have a catalogue for each year. My folder structure is as follows:
If I have two of the same event name I usually add a date to the end: Event11jan; Event26may.
For individual files it's the event name with a date: Event01ja1401; Event01ja02;
I've been using this system since 2007 and it's been working for me.