I looked up ol' Rockin Ron's Nirvana tribute band and found their website. They're called "Nearvana" and they claim to be the longest running Nirvana tribute band in the U.S. and "NEARVANA is the only Nirvana Experience to have the blessings from the three surviving members of the band - Dave Grohl, Krist Novoselic, and Pat Smear." Which I find hard to believe.
Here's their website:
http://www.nirvanatribute.band/And here's Ron coming as he is while ignoring Diocletian's order and emails:
There's also a "promo" section where you can download Nearvana's stage plot in PDF format, which I find should be mandatory for any band's website if they want to be taken seriously.