You have not indicated if what you wanted is an airdrop/bounty with referral program or a fundraising programme with referral, where you can get referral bonus(es) on every investor you invite and that has invested in the project. For those airdrops/bounties, you can search for them here
As for the fundraising programmes, it is not so common these days. If it were to be the time ICOs were still booming, you could have got so much of it, but it has now been found that most of them are scam. So, instead of that, we now have people showing more interest in IEO, which does not usually come with referral. However, you can search through here if you will be able to find one.