Okay, the actual Oktoberfest in Munich, If I am seeing the right dates, begins on Sept. 22.
So, yes, it is actually in Sept.
I am not thinking that Spring, and Fall (as in April - Sept) are high season.
Events like Oktoberfest, of course, would be exceptions.
OP, again, you have no say-so here.
Give them time to arrange a date.
Just have your husband mention that you hope to have the dates as soon as possible.
It really does not come off well to be 'venting and ranting' because of a wedding that is still months away, and a so-called cheap vacation package.
If you are really interested in this package, I would not think that a package purchased this far in advance could not be cancelled without major penalty.
Even 90 days in advance would be a very unforgiving policy.
Read the fine-print or call the agency and find out the details.
If this is a package that involves Oktoberfest, yes, I can see an early booking promo... As this would probably be very popular.
With the promo ending soon, it probably is an early booking thing.
But, it is the cancellation and date-change policies that you need to be concerned with.