Dean will not tell me what upcoming meeting is about. What do I do? I am a tenured professor and co-chair at a small teaching college. I received an email last Friday morning from the head of facilities requesting confirmation of my attendance at a meeting for this coming Thursday, with the subject line "Facilities storage needs and 'MY_DEPT' space." The email was also sent to my Dean, another professor (prof. X) in another department in the same building, and another member of facilities. The text of the email read, "new time suggested because prof. X can't make the original one." That was it- no other text.

I immediately 'replied all' with "This is the first I've heard of this meeting request. Can someone please tell me what this meeting is about so that I can better prepare for it?"

My Dean replied a few hours later with "We can fill you in next week, MY_NAME."

My first thought is that facilities wants to take away space from my small discipline in my small department for their 'storage needs'. In the past 6 years, we've lost two offices, a classroom, and three small storage spaces to facilities, so I may be paranoid. My second thought is that it is unprofessional for my Dean to refuse to answer a direct, rather innocuous question.

I'd appreciate any advice about how to interpret my Dean's behavior, and how to proceed from here.
Go talk to the Dean prior to the meeting, and resist the urge to "reply all" to any mail that might be even remotely contentious.  Email and text messages are good for exchanging facts, such as the time of the meeting.  They are much less good for dealing with disagreement or even potential disagreement.