In Oh! Edo Towns, tour groups come and stay at your inns. How do you unlock more tour groups, and what does each group need in order to accomplish their task?
How do you unlock more tour groups?
The best answer I could find is from this blog and seems to have been copy-pasted all over the web. However, the author admits that these may not be completely accurate.
What do they need to accomplish their task?
My experience has been that their percentage complete rises over time as the group visits shops and spends money.
I found one guide that claimed "Having crafts and combos through building placements will attract more visitors," but it's not clear how they arrived at that conclusion, so I'd take it with a grain of salt.