If nothing goes wrong with their plans later, perhaps the entire scene can be skipped -- you don't want to give the plan to the reader twice, once in dialog, once in actin, either. But if it does go wrong, you may need them to know. Or if it's not lively, this scene may give the necessary stuff shortly. (Such as in the denouement.)
And the scene of decision may be rife with conflict between factions, which is a Good Thing and you don't want to omit it.
Whee. What to summarize, what not to summarize -- in particular, what if the story would be constantly peppered with questions, comments, observations, plans. . . . of course those could be summarized sometimes, with the account, but not always. . . .
The lively life of the writer.