During my regular playtime in Project Gorgon, they had an event/buffs every weekend from Friday night till Monday morning. It would be anything at random, sometimes useful sometimes whatever. Walking faster, crafting xp, more hides dropping, flying for examples.
I think that would be a fun thing to implement to Wurm, it would require not as much effort compared to organising big events.
It would work as a continuation from the 30% chance to gain an affinity, which is great and has people doing things they wouldn't normally do I imagine.
You could have a lot of fun with it and I think it would boost numbers on weekends giving peeps something to look forward too and check out. Ive seen Enkis and devs funny imaginations, this would be a good add.