My ritual is slightly different for each plant I work with....  I only diet ahead of time for Ayahuasca, other plants I dont diet for, though I may skip breakfast if I am doing ceremony first thing in the morning.  Sometimes I also practice vegetalismo which is when you apprentice to a specific plant (psychedelic or not) and diet it for a few weeks straight....

Most ceremonies I will call in the winds/medicine wheel (I do this in a Q'ero style calling I learned) to start and then I will blow mapacho smoke on myself, all the medicine, and if someone else is with me them too.  I will sing a song before we start, then anyone present has the chance to say what they are grateful for, what their hopes/intention for the ceremony is, and also pray for the guidance or healing they need.  Then we start the ceremony.

Often times I am singing during the ceremony whenever a song comes to me that wants to be sung.  Anytime I smoke mapacho or cannabis within the ceremony I will blow prayers into it before I smoke.  If I am with someone who need energy work I will offer it, and if I am with anyone who needs to talk to process through things, then I will help them with that.  I do a lot of emotional/ecstatic prayer too.

Also a lot of quiet meditation time and walking meditation time.  Sometimes I may also add a hape' ceremony into our psychedelic ceremony too.

I find that most but not all times, less is more, so I try to keep ritual minimum so I can focus on the plants teachings.  Just a song every once in a while, otherwise mostly silence unless someone needs to talk something out.

There are many more little things that I may do every once in a while, but those are the main things that pretty much always happen in plant ceremony for me....  Sometimes I do ceremony alone, but I am usually with my wife or especially with someone looking for assistance healing, so there is often 1-3 other people with me....