Without any context, I would choose "doing". Do you have any context?
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Odawara castle is now (showing / doing / [others]) projection mapping.
Which verb should I use before "projection mapping"?
What is projection mapping?
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
The context is that I found the info about the projection mapping on the Net and I'm asking a friend of mine if she wants to go see it with me.
This is it: http://japan-attractions.jp/illumina...dainosho-2014/
Thank you again.
Just for future reference, what if it's a formal situation? Would it still be OK to use "do"?