Hmm. I don't know. Maybe some large indoor shots?
If you are going for a documentary/street look, with 400 and 3200 films, then I don't think the tripod will be of any assistance. Plus, you seem to have missed my comment on how many indoor places do not allow tripods. If you really want to use support use the other kinds that people suggested such as beanbags, mini tripods and monopods. The largest of them, the monopod will fit in your luggage with ease and will not pose any trouble being carried around.
But, the best of advice I can give you, is FOCUS your photography.
Don't bring any gear you have just on the possibility that it might have some use. You have already chosen street/doc as your style and two films that compliment it. If you are going to take a few architectural/landscape photos do it in that style, do it as a Magnum photographer would for example. Include people, look for spontaneity and interesting angles.
A tripod not only would be a hassle but it would go against that kind of style. Sure, people here have their cameras glued to the three legs, but that's THEIR style of photography, not yours. They might use heavy cameras. They might use slow film. They might focus on static city/landscapes. They might want every little shadow detail to show. But that's not your style from what you tell us.
My advice is to bring one camera, one prime lens and the film you mentioned and go out on the street and take photos. You do not need any more gear.
On my trips I used to bring the Hasselblad with one lens (I have four), one back (I have three) and that's it. I almost never used the shutter release cord, never brought a tripod (I have two, one carbon) or a monopod (two, one carbon) and never carried a flashgun. Too much hassle, too much weight, too distracting. Try out equipment on your street, not across the world. When travelling, focus and bring only what you know. That is why I got the Rolleiflex for travelling and street photos. One lens and nothing else is all you need.
