I recently discovered a gamemode/minigame called 'musical blocks' which I think would be a fun addition to AEM in the future. Just tossing ideas out there xD
how about pig racing ? maybe horse racing? Devs come up with a plugin to teleport with animals (while on them or on the leads) and have people bring their own animals to race (obviously only pigs and horses can race) than someone can build a huge map for them to run around, first one to the finish wins