When you activate Streetpass, you will have access to get the Campgrounds. All you have to do is Streetpass someone with a traveler waiting at the Port. It is only through the Streetpass option where you can receive travelers. The only way to make travelers is for two Miis to have a baby that grows up either to travel, or to stay on the island.
Now when a traveler arrives to your island, they will set up camp in the evening automatically and then ask if they can stay.
This Mii will stay for the night and will promptly leave in the morning. If you deny their shelter for the night, they will immediately go to the port and wait until you Streetpass again in order to leave.
If the Mii stays to camp over, you can visit their tent. Inside their tent, they will have a problem, either they’re hungry, have a cold, stomach problems, is dirty or homesick (and needs a music box).
Once solved, they will offer a treasure that you can actually purchase for play coins. The price differs on the item so you should generally have over 10 play coins everyday.
After solving their initial problem, you can give them additional food items, hair dye, bath set or music box to raise their happiness levels.
When you try to leave the tent, they will ask if they should stay up (which will allow you to interact with them at a later point) or go to sleep early (which lets them sleep until they go back to the port to travel).
Now it’s important to note, whether you make the traveler stay up or go to sleep early, they will always pack up and leave for the port to go on their merry way. They will leave the port once you Streetpass again.
Today I’m going to a Tomodachi Life Picnic event in Grover Park, New Jersey hosted by StreetPass Princeton New Jersey from 1:00 – 7:00pm
About the event (taken from their Facebook page):
Can’t get enough of Tomodachi Life then join us for streetpass tags, food and fun at our Picnic Event! If you do not have a copy of Tomodachi Life you can win a copy by taking part in the Song Writing Contest! You must attend the event to part take in the Song Writing Contest.
The song will be used to promote StreetPass Princeton and must be done in the style of a musical. To learn more be sure to attend our event! We hope to see you there!
1:00 to 1:15 Opening Announcements
1:15 to 2:30 Free Play and Song Writing Contest Opens
2:30 to 3:00 pm Pizza
3:00 to 4:00 Last hour of Song Writing Contest and Free Play
4:00 to 4:15 Cake
4:15 to 4: 30 Song Writing Contest Winner Announced
4:30 to 5:00 Free Play
5:00 pm to 5:15 Raffle
5:15 to 6:45 pm More Free
6:45 to 7:00 pm Closing Announcements
The link can be found here