Generally, No.  We need to schedule staff in advance, plus, our activities generally will get pretty full as we get close to the dates.  Also, you get better rates for activities if you book them ahead of time (with an overnight retreat, at least 60+ days in advance).  There are times where we can squeeze a few things in last minute, so it never hurts to ask if a last-minute add-on is possible, but especially if you are planning for a large group, you should plan for that ahead of time.
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