Hello bois, 
in next lines below I ll present to you what you actually got from summer dice event.
As admin explained: Two free cubes are handed out every day. You will receive additional cube for every 1000 weapons or RPG spent in battles, or by buying gold packs in Store. Board can be reset only after all fields are opened.
For one reset you are gonna need 29 cubes. On the board below you can see what you can get per reset if you do same as I do.(Opening cubes for last day ).


So to sum it up in total , per 1 reset you got 2 k energy in food to refill, 1800 RPG to spent , 60 milions of dmg in rockets, 18 work tokens(most important thing for me), 5 golds,5strength,10 intelligence points,around 33 k + energy worth with hypers and energy bars ,temp q2 booster, house q3 and amazingly important 1000 experience points. :D