Etherjs Events

const Web3 = require('web3');
const web3 = new Web3('// your rpc url here');

// connection to smart contract
const address = // your contract string
const abi = // your contract abi here
const contract = new web3.eth.contract(abi, address); // your contract instance

contract.getPastEvents(
	'AllEvents', // you can send any event name like 'transfer' or something
	{
			fromBlock: 0,
			toBlock: 'latest',
	}, // can provide a block range here to filter your events
	(err, events) => {
		console.log(events);
	}
	
	// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
	here you can see all openzeppelin events ('predefined events')
	

now the events which are consoled have all the events which had occured between block 0 to the very latest block
there are other ways to get events such as filtering events


contract.getPastEvents(
	'AllEvents',
	{
	filter: {
	value: 'name of event' or ['event 1', 'event 2'],
	date: // can filter by date
	,
	(err, events) => {
		console.log(events);
	}
by this way you can add some more filter to events

And last method of getting events i have already explained using event emitters 
// https://hashnode.com/draft/62556a336386ed96b050c946