diff --git a/contracts/tasks/index.ts b/contracts/tasks/index.ts
index 8cd3f1ac2..9b70e8528 100644
--- a/contracts/tasks/index.ts
+++ b/contracts/tasks/index.ts
@@ -17,3 +17,4 @@ import './tally'
 import './findStorageSlot'
 import './setStorageRoot'
 import './loadMerkleUsers'
+import './simulateVoting'
diff --git a/contracts/tasks/simulateVoting.ts b/contracts/tasks/simulateVoting.ts
new file mode 100644
index 000000000..1cff4386c
--- /dev/null
+++ b/contracts/tasks/simulateVoting.ts
@@ -0,0 +1,222 @@
+/**
+ * This script is used to simulate mass voting for testing purposes.
+ *
+ * sameple usage:
+ * yarn hardhat simulate-voting --fee 0.003 \
+ *   --coordinator-pub-key <Coordinator's MACI serialized public key> \
+ *   --total 20 \
+ *   --factory <funding round factory contract address> \
+ *   --contributors 30 \
+ *   --recipients 2 \
+ *   --network arbitrum-goerli
+ */
+import { task, types } from 'hardhat/config'
+import { createMessage, PubKey, Keypair } from '@clrfund/maci-utils'
+import { HDNode } from 'ethers/lib/utils'
+import { getEventArg } from '../utils/contracts'
+
+function getRandomRecipient(min: number, max: number) {
+  return Math.floor(Math.random() * (max - min + 1) + min)
+}
+
+task('simulate-voting', 'Simulate voting for the current round')
+  .addParam(
+    'factory',
+    'The funding round factory contract address',
+    undefined,
+    types.string
+  )
+  .addParam(
+    'contributors',
+    'The number of contributors to simulate',
+    5,
+    types.int
+  )
+  .addParam('recipients', 'The number of recipients to simulate', 2, types.int)
+  .addParam(
+    'total',
+    'The total amount of tokens to run this test with',
+    undefined,
+    types.string
+  )
+  .addParam(
+    'fee',
+    'The amount to fund the contributor wallets to pay for transaction fee'
+  )
+  .addParam('coordinatorPubKey', 'The MACI public key of the coordinator')
+  .setAction(
+    async (
+      { factory, recipients, contributors, total, fee, coordinatorPubKey },
+      { ethers }
+    ) => {
+      const mnemonic = process.env.WALLET_MNEMONIC || ''
+      const [coordinator] = await ethers.getSigners()
+      console.log('coordinator', coordinator.address)
+
+      const pubKey = PubKey.unserialize(coordinatorPubKey)
+
+      const factoryContract = await ethers.getContractAt(
+        'FundingRoundFactory',
+        factory
+      )
+      const roundAddress = await factoryContract.getCurrentRound()
+      console.log('Current funding round', roundAddress)
+
+      const fundingRound = await ethers.getContractAt(
+        'FundingRound',
+        roundAddress,
+        coordinator
+      )
+      const maciAddress = await fundingRound.maci()
+      const maciContract = await ethers.getContractAt('MACI', maciAddress)
+      const tokenAddress = await fundingRound.nativeToken()
+      const token = await ethers.getContractAt(
+        'ERC20',
+        tokenAddress,
+        coordinator
+      )
+      const userRegistryAddress = await fundingRound.userRegistry()
+      const userRegistry = await ethers.getContractAt(
+        'SimpleUserRegistry',
+        userRegistryAddress
+      )
+
+      const decimals = await token.decimals()
+      const totalAmountInUnits = ethers.utils.parseUnits(total, decimals)
+      const contributionAmount = totalAmountInUnits.div(contributors)
+      const feeInUnits = ethers.utils.parseUnits(fee)
+      const hdnode = HDNode.fromMnemonic(mnemonic)
+      console.log('contribution amount', contributionAmount.toString())
+
+      for (let i = 1; i <= contributors; i += 1) {
+        const contributorHdNode = hdnode.derivePath(
+          ethers.utils.getAccountPath(i)
+        )
+        const contributor = new ethers.Wallet(
+          contributorHdNode.privateKey,
+          ethers.provider
+        )
+
+        // register user if not registered
+        const isVerifiedUser = await userRegistry.isVerifiedUser(
+          contributor.address
+        )
+        if (!isVerifiedUser) {
+          const addUserTx = await userRegistry.addUser(contributor.address)
+          await addUserTx.wait()
+        }
+        console.log('Contributor', i, contributor.address)
+
+        // fund wallet
+        const contributorBalance = await ethers.provider.getBalance(
+          contributor.address
+        )
+        console.log('Account balance', contributorBalance.toString())
+        if (contributorBalance.lt(feeInUnits)) {
+          console.log('funding wallet', feeInUnits.toString())
+          const fundTx = await coordinator.sendTransaction({
+            to: contributor.address,
+            value: feeInUnits,
+          })
+          await fundTx.wait()
+        }
+
+        // transfer usdc
+        const tokenBalance = await token.balanceOf(contributor.address)
+        console.log('Token balance', tokenBalance.toString())
+        if (tokenBalance.lt(contributionAmount)) {
+          const transferTx = await token.transfer(
+            contributor.address,
+            contributionAmount
+          )
+          await transferTx.wait()
+          console.log('transfered token')
+        }
+
+        // contribute
+        const allowance = await token.allowance(
+          contributor.address,
+          fundingRound.address
+        )
+        console.log('Token allowance', allowance.toString())
+
+        if (allowance.lt(contributionAmount)) {
+          const tokenAsContributor = token.connect(contributor)
+          console.log('Approving token..')
+          const approveTx = await tokenAsContributor.approve(
+            fundingRound.address,
+            contributionAmount
+          )
+          await approveTx.wait()
+          console.log('Approved token to funding rond')
+        }
+
+        const contributorStatus = await fundingRound.contributors(
+          contributor.address
+        )
+
+        console.log(
+          'Previously contributed voice credits',
+          contributorStatus.voiceCredits.toString()
+        )
+
+        if (contributorStatus.voiceCredits.gt(0)) {
+          console.log(`${contributor.address} already contributed`)
+          continue
+        }
+        const contributorKeypair = new Keypair()
+        console.log(
+          'Contributor privake key',
+          contributorKeypair.privKey.serialize()
+        )
+        const fundingRoundAsContributor = fundingRound.connect(contributor)
+        const contributionTx = await fundingRoundAsContributor.contribute(
+          contributorKeypair.pubKey.asContractParam(),
+          contributionAmount
+        )
+        const stateIndex = await getEventArg(
+          contributionTx,
+          maciContract,
+          'SignUp',
+          '_stateIndex'
+        )
+        const voiceCredits = await getEventArg(
+          contributionTx,
+          maciContract,
+          'SignUp',
+          '_voiceCreditBalance'
+        )
+        console.log('stateIndex', stateIndex.toString())
+        console.log('voiceCredits', voiceCredits.toString())
+
+        // get random project between 1 and recipient count
+        const recipientIndex = getRandomRecipient(1, recipients)
+        console.log('Recipient index', recipientIndex)
+
+        // create message
+        const nonce = 1
+        const [message, encPubKey] = createMessage(
+          stateIndex,
+          contributorKeypair,
+          null,
+          pubKey,
+          recipientIndex,
+          voiceCredits,
+          nonce
+        )
+
+        // vote
+        console.log('sending votes')
+        const voteTx = await fundingRoundAsContributor.submitMessageBatch(
+          [message.asContractParam()],
+          [encPubKey.asContractParam()]
+        )
+        await voteTx.wait()
+        console.log(
+          i,
+          `${contributor.address} voted with ${contributionAmount} credits`
+        )
+        console.log('')
+      }
+    }
+  )