# Attendance

Activity attendance is an integral part of the on-chain footprint, and POAP is the proof of attendance for on-chain activities. Developers can query a user's past POAP attendance credentials to infer that the user the address points to might be a potential participant in an activity.

### **POAP attendance events**

POAP is Proof of Attendance Protocol，each POAP is a digital record held by collectors as digital proof that they attended, or participated in, a physical, virtual, or spiritual event. Developers can check the POAPs obtained from address participation in web3 activities by querying the address.

* Address of the participating POAP

```
{
  addrs{
    address
    attendEvents{
      name
      id
    }
  }
}
```

* Which addresses are participating in POAP

```
{
  events{
    id
    name
    addrsAttend{
      address
    }
  }
}
```

**Explanation:** The result shows the all poap events the address `“0x896002e29fe4cda28a3ae139b0bf7bac26b33a8c”` has once participated in, and we may get a conclusion that this user may be an art amateur. Thus we can consider he/she as a potential participant if there is a new web3 project related to art field.