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The only things you'll usually find designed to be played by multiple groups are convention events. Most normal products are intended to be one group affairs, but some can gain something with a second group in parallel.
One I ran into recently is splitting Kingmaker into a leader group and an explorer group. That might be a bit bigger picture than you're thinking, though.
Traditionally, dungeon crawls have been used for this, with each group exploring a dungeon and seeing the effects of the other group's exploration. Emerald Spire could work well for that.
Cheers!
Landon
In the 3.5 era, we wrote Rangers Lead the Way as a battle interactive for Living Greyhawk in the Principality of Ulek metaregion, and it was designed for 6+ groups, with encounters at APL2, APL4, APL6, APL8, APL10-12, and APL14, with the highest APL table designated as a "Command Table." It was a two-rounder, with 3-4+ event possible in the first round, then three events in the second round. Events were almost entirely combat oriented, as this involved the capture of a massive humanoid-monster-occupied fortress. Second round events were broken out at APL2-4, APL6-8, APL10-12, and APL14. Events at different tables could influence other tables; particularly the APL2-4 influenced the Command Table, the APL6-8 tables could assist one another, and the APL10-12 tables might directly influence end events (everyone influenced events, but those tables saw significant objectives).
It ran...5 times at different conventions, IIRC, and was quite well received.
-Ben.