Agree as well .

Events are currently limited to collect X th*e X on final day of events or credit card us for goodies (any gold recharge or use event).

Why not "event plotline" (a set of fight with a pseudo plot involving the main character only available for a limited time and awarding some special coins).

Something using the randoms enemies found in everymap (the ones giving ninja exp) like kill 100+ and get rewards.

Roaming boss ? Super treasure hidden by hints (you have "digs" that can be used anywhere but limited)