The below only applies when you’ve booked an activity. When you’ve booked a meal or homestay you will most likely meetup at somebody’s house.
If your host has a picture in his/her profile this should help you recognize them. Likewise, if you upload a picture to your profile this will help your host to find you.
However, if your host does not have a profile picture and you are worried that you may not find each other, you can send him/her a message via MeetJune’s message service to ask for more details, or to request they bring something identifiable to help you recognize them.