For a good grounding on the basics of how events run, and what to do, please see ElvenGems basics
here.
Events are Announced
here. This is a good place to look for details.
The wiki has good information about each event.
Several different player sites offer support, of various types, as well.
For building sizes and shapes please see the
Elven Architect . This site works in browser only. Today the Architect has the values loaded.
This
Italian site always has the quests, prizes both daily and grand, chests and strategy. The information is well organized and each section has a page. But it is in Italian, so translation is required.
TomatoHue has a multi page google doc that contains a color coded quest list that you may copy to track your progress, collect information on new buildings and strategic analysis, that she pulls together for each event.
iDavis https://idavis-elvenar.com/events.html has the new buildings as part of the current event and older ones viewable in tab, the quests in a list that can be used to track progress, and is now adding in some strategy and analysis. His videos are also available there
Jackluyt has a large file that often contains a collection of event information, and includes links, videos, quest lists and tables. There is a great deal of information in these files, scrolling around or searching is required to locate specific information.