If its just about keeping track of the last occurence of the type of event that is anyway hard or impossible to influence (e.g. last time you won the lottery, last time you were sick etc.), then this app can help you do that.
But unlike many other reviewers, I fail to see the use of the app to track events or tasks that should happen with a certain regularity (e.g. work out, vacuum clean, eat fish, plant seeds etc.).
Thats because one very important functionality is missing (still): to define how much time should pass to the next ocurrence and to remind the user that its time to repeat the activity. While a certain activity might need repeating every second day, another activity might require your attention just twice a year. Without this information, you are working with a pretty much unordered list of activities that is very difficult to analyze.