OutDoor Event stage!
This is an idea I've had for abit. It is a mix of Club LOL and the Event plaza in PWP form, so basically an open air theatre. Instead of having the club venue, things could open up in this area that wouldn't/couldn't opened up in the event plaza due to the tree being there. In this place I would expect things like Dr. Shrunk's performances, K.K. Slider DJ/live performances, possible circus performances, possible Cat-walk for Gracie fashion shows, Kapp'n singing, and maybe even player hosted events. If the player is mayor again in Switch, maybe before setting up something, the special animals would ask you in advance if they could set something up there, possibly choosing the theme (for gracie, you'd choose the style like iconic or basic, etc). Player hosted events could be more along the lines of a talent show that either villagers or other players could participate in, a show off contest, showing off the most valuable items you have, and more. To add more variety to something along the lines of a talent show, I also have another idea...
Music composition!
Like everyone else, you are able to work with a short, simple, and cute town tune that allows you to hear alot of villagers play it when you talk to them, the bell play it, and even the convenience store play it. While having that, I would like to see an expansion on it that would make the instruments useful. Adding things like music score that would be bought from the store that you would use to make the instruments play the notes you want them to play. the system could be the same as the regular one, just larger with each sheet that you have. If your score went beyond the page, it would extend to another page that you have and add to the composition or just end because you ran out of paper. Since the instruments aren't real, they wouldn't need a big expansion on music score and would just be settled on different pitches of the instrument. feeding the score to an instrument, a gyroid, or even a villager would be fantastic, having any of them play it for you to see how it sounds in different instruments or a villager's voice (or the sound the villager makes when playing the town tune) would be very interesting. You wouldn't be able to have multiple different songs go on at once at your house, but if you practiced in the open air theatre you'd be golden, as you could have a practice session by laying out instruments, gyroids, and villagers to play at the times that you want them to. The music scores would have to be stored like letters in a different tab so that it doesn't take up too much space. Different Varients of Lyoid or maybe villagers with special talents could play the instruments while you conduct/play with them. Having yourself and some villagers in a band-like scene would be a beautiful addition to the game in my opinion.