I hope we will celebrate festivals like they did in ancient Israel but imagine the fabulous style with which we celebrate as a perfect society. If Jehovah does decree festivals, imagine how we will commemorate our deliverance through the tribulation. Think of the songs we will write, think of the ways we will express our joy and our thankfulness. International Conventions are a small glimpse of our potential for celebration.
And while there is reason to believe we won’t live in cities, on some level we will still need design for structures and if we do have any version of cities things like city planning will be done perfectly. In every part of the world I have visited I have always observed some public area or structure that has been poorly designed. In the new world that will not be an issue, plus we will not need to worry about issues like security or hostility or even disabled accessibility; two elements will rule when it comes to design - style and practicality.
It is a true joy of mine to see style and practicality combine to make something beautiful, whether it be in fashion, inventions, or architecture. That is a hallmark of Jehovah’s creations, beautiful but purposeful. In the new world we will be free of today’s constraints i.e. money, time, self-interest etc. and we will be able to design, plan and build to our heart’s content and all without harming the planet, everything in harmony.