I'm gonna get off the bandwagon since it's got a nice enough advantadge that this shouldn't affect things.
[X] Nothing (wrong) that can't wait, but we'd like to talk in person, soon. Tomorrow, if not tonight.
-[X] That said, is it really that late? We were hoping we could hang around at least a little while? Actually, we've wanted to visit Madoka's house for some time now. We're sorry to ask at an inconvenient moment, but we kind of already convinced Homura to come along and she knows how hard it is to convince Homura of anything, right? We had to get her down from a tree.
-[X] If Madoka's convinced, see if you can buy some sort of appropriate gift on the way, like sparkling grape juice or something. Consult Mami/Homura.
--[Q] Curse your being underage.
--[X] Share you plans of talking with Madoka about Sayaka and Hitomi, and asking her for advice in general. Otherwise, you really just want to hang around.
-[X] If Madoka's not convinced/her parents don't allow the visit, ask if you can meet tomorrow morning and reassure her that things are going actually pretty well.
--[X] Apologize to Homura and offer her to have dinner at our place, unlikely as it'd be for her to accept. Either way, reassure her that things will be fine and, if she decides to stay, hug her goodbye.
[X] On the way wherever you're going, telepathy Secretary Yuma and ask for the play-by-play of the Kyouko-Sayaka meeting. Confirm reports of tsundere-ness.