Reply #1: It's difficult to estimate the value of such items.

[MineralMan]

Since most have not come up at auction previously, much less as a group, there's probably no historical auction value to use.

Ephemera like yours has more historical than monetary value. Some of the items, like the Panther publications, probably exist in some small numbers, since many people kept such things. The numbers are low, though, no doubt. The telegram may be unique, since it was probably discarded by most recipients. The photograph, if original, will be unique, and may have some value to collectors of Joan Baez ephemera.

Still, the small archive you have there would be of great interest to someone publishing a book on the period. For that use, it could probably by loaned, rather than donated. If the goal, however, is to build an archive of ephemera from that series of events, then donation would be desired.

Put into an ephemera auction, I doubt the pieces you mention would bring more than $50 as a group. That's just a guess, but, that's my top estimate.

Added: The large poster is the item most likely to have some additional value. It should probably be auctioned separately. If it has interesting graphics, it might bring more... Condition is everything.