This is from my old blog.
This is my Poseidonia Festival page. This is done in honor of Poseidon and all the things that he’s given us. I really feel drawn to Poseidon and I love honoring him when I can. This one is to honor him and to thank him. I hope that this helps and that you can get something from it.
1) Purify the Altar area.
2) Take the barley and say, “As it was done in ancient times. I purify and cleanse this altar with this barley. With this barley I purify this altar and space so that I may give offerings, libations, and speak with glory and respect the gods of Mt. Olympus.”
3) Light a candle and say a hymn to Hestia.
Hestia, you who guard the sacred shrine of the Lord Apollon. The far-darter at goodly Pathos. With soft oil dripping ever from your locks. Come now to this house, come having one mind with Zeus the all wise-draw near, and with all bestow favor upon my song.”
4)Prayer to Hestia
Hestia, gracious goddess who sits at the heart of each home, who lives in the heart of each one who reveres you, each one who holds you dear, each one who turns to you for strength and harmony.
Hestia, goddess most needful, goddess most serene, goddess most esteemed, the heart of the city is yours as well, great goddess; within your realm are those who serve the state, who work for all the good of all–your blessings fall on the honest, goddess, your wrath on the corrupt, on those who betray their trust for gain. Defender of the householder, guardian of the hearthfire, Hestia, I praise and honor you.
5) Let Poseidon know that your there. Say this by saying, “Poseidon, here me.” This isn’t a command, this is letting him know that your here. Then tell him why your here and let him know what offerings you’ve given him and what he’s done for you. This is very important.
6) Do an Invocation to Poseidon
I call to Poseidon, great god of the seas, fond husband of ocean-dwelling Amphitrite, son of ancient Kronos and wild-hearted Rhea, father of noble kings and mighty heroes.
In distant days were you well known; in Crete your name was carved in clay; in Corinth were you honored well, and in all the provinces.
Dark haired Poseidon, you hold in your hands the waters of the world, those briny depths that brought us all into life; that carried mankind to many lands, to gather wealth and wisdom; that nourished our furthest forebears and formed the patterns of our lives.
Poseidon, maker and master of horses, trident-bearer, earth-shaker, lord of the beasts of the deep, lord of the thrashing waves, sea-god, I call to you.
7) Do a hymn to Poseidon
I begin to sing about Poseidon, the great god, mover of the earth and fruitless sea, god of the deep who is also lord of Helicon and wide Aegae. A two-fold office the gods allotted you, O Shaker of the Earth,  to be a tamer of horses and a saviour of ships!
Hail, Poseidon, Holder of the Earth, dark-haired lord! O blessed one, be kindly in heart and help those who voyage in ships!
8) Give offerings, saying, “Lord Poseidon, Lord of the Deep Oceans, Middle of the Three brothers, earth shaker, lord of horses, I give this offering to you.”
9) Pour libations to Poseidon, though you must give the first one to Hestia.
10) If you want to you can pray to Poseidon and ask him for what you need.
11)Prayer to Poseidon
Deep-dwelling Poseidon, shield of sailors, stiller of storms, shaker of the earth beneath us, I praise you.
Well known you were in days of old, honored above all others in far-famed Corinth; your temples stood throughout the ancient lands, each floor well polished by the feet of the devoted.
In times still longer past, still further lost in time, were you among the first of gods whose names were known to men, the first whose might was honored, the first who answered desperate please with dear blessings. Poseidon, whose voice we hear in the crash of waves, whose hand guides the fate of all who venture out upon the sea, to whom we owe thanks for transport and trade, for salt fish and sweet water, I praise you.
12) Finish this ritual by doing a closing to Hestia.
End the ritual by saying, “Hestia, goddess of home and hearth, to you I offer last of all as a pious mortal should. Tend to those whom I love and guard the houses of the pious. As the gods will it, so it shall be.”
It is so!
Dump the entire container that you’ve poured your wine or grape juice into outside and then that ends it.