I've enjoyed these events in the past. A week left me with enough time to hatch monsters that have been sitting in storage for ages and devote time to ranking up others. Last time around, the points needed were increased, but I could still get some chests.
This time we have 3 days. That isn't even close to be workable without investing gems. I'm still doing a little to try to get the first chest or two, but the third is out of my reach and it's frustrating to see what was a fun event become something only for those who buy gems.