...Is there any app which can notify you before 15 days of an event? I would like to get all the possible ways to get such event update. Please share which one do you use.
I have been using the "Cryptocurrency calendar" in my work for a long time
https://coindar.org/. I see that this site has not been mentioned in the topic before. In my opinion, this is exactly what you were looking for) This service contains the main announcements of events that should happen in the coming days and months.