I think you at least have to beat the Heaven bonus boss before Margaret gives you the invitation (on 3/20 after you get Orb of Sight). That's presumably so that it's out of the way for the encounter. I'm not sure about if you have to have done the rest cos I always did.
So you should be fine. I only ever did the bonus bosses once a new dungeon opened anyway. Never spend more time in the TV than you have to.
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