Here is a link to 132 typefaces that came up after searching MyFonts for 1910s.

http://new.myfonts.com/search/1910s/fonts/

NRG, That's helpful, but it's so many. Could anyone narrow it down for me with an educated opinion? What would you use?

I also thought of a Rennie MacIntosh stylez

What about Hill House?
http://www.hicksdesign.co.uk/goodies/

Try Bembo, its historically accurate (a revival designed in 1929) but I think it will have a nice period feel and will be closer to 1919 than comic sans...

Thanks, I love the Hill House. But most of the people at this event would likely have no idea it's a famous early 20th century style - they might see it as a bizarre science fiction sort of thing.

I'd like to use something anyone would recognize as quaint American type. Maybe Saturday Morning Toast by Nick, which he says is based on the old Saturday Evening Post logo. But that is more 20s.

sorry, i meant inaccurate of course

Here are some fonts popular c. 1919:

Cheltenham (NOT the ITC version, though)
Caslon Old Face
Packard
Bookman (NOT the ITC version or the Bookman Old Style that Microsoft bundles)
Pabst Oldstyle
Powell
Post Oldstyle
DeVinne ( Romana Bold is similar)
Della Robbia
Hadrianno
Artcraft
Kennerley
Goudy Oldstyle

Geeza and Mark S,
Oh thank you! I already have Artcraft and I never get to use it. That would look very nice.

Mark is on I think.

Is ITC other than Franklin Gothic ever an option? Not like I could do a whole lot better, but damn they ugly. :)

It depends on the look you are after. But if you want to be true to the period (unless it's '70s or '80s), steer clear of the ITC revivals.

Thanks to all.

I do want to suggest the period, but it's ephemera - I'm not too worried about authenticity. The guests (who are not designers) will notice "It looks quaint" or reminds them of materials they've seen from the WWI era - they'll like it.

Now if we were doing the 1940s, yeah, they might actually be familiar with that era.