1 Corinthians 5:7
"Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
8 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth."

Unless one spiritualizes away the secondary teaching of the above scripture, verse eight makes it rather clear.

So are we to go out and slaughter a lamb? Christ is our passover lamb. There is no need to kill a lamb. The sacrifice has already been performed.

What should we do then? Well my advice is to gather your family together on the 14th day of Abib which is 3 April, 2 April in leap years, or one month later if you miss it and take communion. (Nissan is the first month of the Babylonian lunar calendar and is not scriptural.) Do it at home with your family. Use unleavened bread as is mentioned in verse 8 and fruit of the vine. Anything else you would like to do such as read scripture and sing as a family is fine. One note though if you should decide to serve lamb just to do it, don't oven or pan cook it. Grill it or cook it so the fat can run off and away. It won't taste very good otherwise. Eating some bitter herbs, I am told, has some health benefits.

Polycrates records that they observed the Passover. It is recorded by at least one congregation that the apostle John taught them to observe the passover. Based on the above verse it sure does look like we should as well.