Lets do this.
So, as we know we have 3 energy per day. Now lets get Winter event as example, because i remember the points given.
The winter event was 21 days long, 3 energy per day makes it 63 at the end.
Now let's multiply that by the points given from the last boss which was around 112 if im not mistaken.
63*112=7245 points.
Reaching platinum event required 12050 points. So you can't reach platinum tier.
It is not possible.