[Galadria]

Yep, happened to me, when I accidentally went to the Illithid dungeon before I got the quest from Matron Mother. Go to the Temple, kill everybody there, get the true eggs, Invisible everybody, (or not, if you just want to kill 'em all, like the prev. post said-I've done that too) anyway, if Matron Mother hasn't sealed the town, just waltz out, give the eggs to Adalon, and you're golden. BTW, NEVER go into a new area without saving, first. If MM has sealed the town, kill her, that unseals it. She's at the Temple.