Tips:

Save your stuff! Here is a list of good things to save for events to maximize rewards during certain events:

 

-Gems

-Hero Shards

-Building upgrades speedups

-Research speedups

-Troop training speedups

-Hammers

-Excessive Rss

-chief gear upgrades

 

List will expand as we progress the season

Note some of these are nuance, such as rss. You should always be building something researching and training, just not pushing those out of events