You are certainly not alone in 2020 being the first no-concert year since, for me, 1969. Tool and LP (Laura Pergolizzi) were on my schedule, but luckily I have seen them before.
As to concerts I wish I had seen.
The Allman Brothers "Live at the Filmore East"
Woodstock (without the mud)
Adele at Royal Albert Hall
The BBC Concerts from 1970 - 71 by Elton John, Neil Young, Cat Stevens and James Taylors.
Any concert by Amy Winehouse.
As to concerts I wish I had seen.
The Allman Brothers "Live at the Filmore East"
Woodstock (without the mud)
Adele at Royal Albert Hall
The BBC Concerts from 1970 - 71 by Elton John, Neil Young, Cat Stevens and James Taylors.
Any concert by Amy Winehouse.