I've found a couple listings of Hal Holbrook's "Mark Twain Tonight"
on the web and thought folks might be interested.  One performance
will be in Easton, PA (on the New Jersey border east of Allentown)
as follows:

"Mark Twain Tonight!" starring Hal Holbrook. State Theatre, Easton.
Tuesday, Nov. 19, at 8 p.m. $29.50 and $24.50.  (610) 252-3132.

This info is from the "On Stage" part of the Calendar page of
the Times-Leader newspaper's entertainment section at

There is also a Michigan performance listed at

It's possible that Ticketmaster lists other performances but their
server seems to have temporarily gone down or become bottlenecked
while I was trying to check.

Is Holbrook responsible for the seemingly universal portrayal of
the white-haired, white-suited Twain (applied even to Twain in San
Francisco on Star Trek TNG) or did it start earlier?

Jim Zwick