My suggestion is that, for the week of St. Patrick's Day, there's an "emerald clover" gate available for use. This gate would function much like any other as far as strata design from minerals, but it would (1) not contain any bosses, and (2) have at least one randomized floor per strata. The lucky among us will have plenty of treasure vault experience, while the unlucky will have to bring their zombie-hunting gear for the graveyards.
If there's a special event planned, have one of the three/four possible random levels on the randomized floor be an area designed for the event.
I would like to see something bigger than that. Like a gate with special levels and at the end of the 1 and 2 tiers theres a relatively easy boss that gives you tokens wich you can use to purchase event stuff.