The selected bid NFT controls how long voting units can be minted. When party NFT transfers, voting units follow.

PartyNFT.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/draft-ERC721Votes.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract PartyNFT is ERC721, ERC721Burnable, ERC721Enumerable, ERC721Votes, Pausable {
    ERC721 immutable bidChoice;

    mapping(address => uint256) public favors;

    constructor(
        string memory name, 
        string memory symbol,
        ERC721 bidChoice_
    )
        ERC721(name, symbol) 
        EIP712(name, "1") 
    {
        bidChoice = bidChoice_;
        _pause();
    }

    function startParty() public virtual {
        if (bidChoice.balanceOf(address(this)) != 0)
            _unpause();
    }

    function contribute() public payable virtual {
        if (bidChoice.balanceOf(address(this)) == 0) {
            unchecked {
                if (balanceOf(msg.sender) == 0) {
                    _safeMint(msg.sender, totalSupply() + 1);
                }
                favors[msg.sender] += msg.value;
            }
        }
    }

    // OpenZeppelin Overrides

    function _beforeTokenTransfer(
        address from, 
        address to, 
        uint256 tokenId
    )
        internal
        virtual
        override(ERC721, ERC721Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override(ERC721, ERC721Votes) {
        uint256 fvrs = favors[from];
        favors[to] += fvrs;
        _transferVotingUnits(from, to, fvrs);
        super._afterTokenTransfer(from, to, tokenId);
        delete favors[from];
    }

    function _getVotingUnits(address account) internal virtual override(ERC721Votes) returns (uint256) {
        return favors[account];
    }

    // The following functions are overrides required by Solidity.

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, ERC721Enumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}