As a preface, I play in pacific time zone (PST), usually around 11 PM, which I know is not ideal play time. However, that is when I'm generally available to play, so suggestions to play at a different time really are not useful, nor do they solve the problem for people even more time zone challenged.
Recently, I found that I needed map currencies (HoT, geodes from dry top). The best way to get those is by doing map events. However, some events are difficult/impossible without decent sized groups (champions, or the metas on HoT maps), and even for other events, the more players participating, the faster the event typically completes, so you get more currency in the given time (Drytop has the other mechanic where as events are done, the favor of zephyrites increases, which means you get more loot for the same events than if done at a lower tier)
However, the few times any of those maps happened to in the daily event rotation, even at that time night, population was large and getting events done was easy. So my suggestion is this:
In addition to the existing daily (gatherer, vista viewer/mini game/etc), there are 2 different maps available for map events. 1 would be the core maps - getting people to do events there can be useful for things like collections that requiring killing champions. The second would be a rotation of the LS2/HoT/PoF maps (of which there are about a dozen total).
In addition, like how the LS3 and LS4 is done, these would be on a fixed schedule, so I could know that next Tuesday may be Auric Basin, and Friday after that would be Silverwastes as an example. As is now, one has no idea when a map may show up - I've been waiting for Elon Riverlands bounty hunter for a couple weeks now.
I hope there is enough population to support this - if not, then there are probably bigger issues with server population that needs to be addressed (or maps otherwise rebalanced).