
Losobal |

You can summon and dismiss your eidolon as much as you want, though the general ritual takes a decent chunk of time, and assuming you don't want to burn the summon eidolon spell unless it was REALLY needed.
So yeah, it becomes a choice, do you want to have 'less hassle' but more potential risk, by dismissing your eidolon while you walk around the city, or have it ready/next to you, but also making your travel very fricking obvious? :)