>> “I’m guessing that Ms. Palin’s and/or the other speakers’ boilerplate contracts contain significant security requirements .... and this group can’t afford it.” <<
.
Or even possibly they had been overly optimistic about Palin signing on. A number of orgs here locally have tried to set up Palin events, with no success.
Who has even heard of “The Sharon K Pacheco Foundation?”
Not me. Their website is here. Looks like their hearts are in the right place, but it's hard to tell what sort of organization they really are.