This list will grow, never fear.
These are more Babylonian than Sumerian. The Sumerians didn't leave a lot of written rituals; their society was a little too early for that, but the Babylonian-Akkadian rituals have a lot of Sumerian elements. If you want to adapt some of these rituals for modern use, just take out the political elements, reset the time schedules (some of the rituals lasted a couple of weeks), and update for your own use.
The concept of absolute good vs absolute evil is not native to the Near Middle East; it was brought in via the Persians, mostly, and texts such as these began appearing in the later Babylonian times. I'm including them here for people who like a little more theater with their rituals.
Babylonian New Year Program
Entering the Netherworld
The Exorcism Incantation "Ban, Ban!"
The Uruk Incantation, "I have taken a magic bond from the wooden roof in silence,"
The Amulet from Arslan Tash This is Canaanite, but it's a good example of how people get Lilith confused in myths vs legends. Lilith does not exist in Sumero-Babylonian myths, and this demon, named 'lilit' (there is no 'TH' in the language), is a winged sphinx, not an owl.
These are PDF's. They may take a little time to open, but the links to work. If you really have a problem opening them, let me know and I will email the specific article to you.
The Ritual for the Covering of the Kettle Drum
Ritual for the Repair of the Temple
Temple Ritual for the Sixteenth and Seventeenth Days of an Unknown Month at Uruk
Program of the Pageant of the Statue of the God Anu at Uruk
Daily Sacrifices to the Gods of the City of Uruk
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And by all means, let me know if a link doesn’t work. There are a lot of pages on my site, and I try to make sure all links are updated, but sometimes the gods have other plans in mind.