Onitsha ceremonial life involves a series of festivals, with each festival forming part of a continuum that helps to symbolically relate each aspect of social life to the wider reality. Six main festivals are celebrated in one Onitsha year. The basic sacred divisions of the year are set by the phases of the moon. The Obi proclaims each of the 28-day lunar months ONWA and defines the ceremonial sequences in terms of the seven four-day weeks OGE ISA that comprise each month.

S/N	EVENT	WEEK DAY	MKT DAY	MONTH	DATE
1	Ifejioku	SUNDAY	OYE	JANUARY	02
2	Ika Ajachi	FRIDAY	OYE	JUNE	02
3	Ilo Ajachi	SUNDAY	OYE	JUNE	19
4	Ika Umatu	SATURDAY	OYE	AUGUST	06
5	Umatu Eze Onicha	SUNDAY	OYE	AUGUST	14
6	Umatu Eze Idi	THURSDAY	OYE	AUGUST	18
7	Umatu Ikpala Isi	MONDAY	OYE	AUGUST	22
8	Umatu Ososo Ikpala Isi	FRIDAY	OYE	AUGUST	26
9	Umatu Onicha	TUESDAY	OYE	AUGUST	30
10	Ido Anyu	SATURDAY	OYE	SEPTEMBER	03
11	Iwaji Ikolo Awada	TUESDAY	OYE	SEPTEMBER	27
12	Iwaji Ikpala Awada	WEDNESDAY	AFOR	SEPTEMBER	28
13	Iwaji Ikolo Eke	THURSDAY	NKWO	SEPTEMBER	29
14	Iwaji Ikpala Eke	FRIDAY	EKE	SEPTEMBER	30
15	Iwaji Ikolo Ubene/ Ubulu N’Ikem	SATURDAY	OYE	OCTOBER	01
16	Iwaji Ikpala Ubene/Ubulu N’Ikem	SUNDAY	AFOR	OCTOBER	02
17	Igo Urai	MONDAY	NKWO	OCTOBER	03
18	Mgbapu Afa Obodo	TUESDAY	EKE	OCTOBER	04
19	Inye Ukwu Na Nlo Eze Onicha	TUESDAY	EKE	OCTOBER	04
20	Iwaji Ikolo Ugwunaobamkpa/ Ekwensu	WEDNESDAY	OYE	OCTOBER	05
21	Iwaji Ikpala Ugwunaobamkpa/ Ekwensu	THURSDAY	AFOR	OCTOBER	06
22	Ogbalido	FRIDAY	NKWO	OCTOBER	07
23	Inyepu Ukwu Na Nlo Eze Onicha	SATURDAY	EKE	OCTOBER	08
24	Ofala	SUNDAY	OYE	OCTOBER	09
25	Azu Ofala	MONDAY	AFOR	OCTOBER	10
26	Iwaji Ikolo Ikpala Eze	FRIDAY	AFOR	OCTOBER	14
27	Iwaji Ikpala Eze	SATURDAY	NKWO	OCTOBER	15
28	Ito Ukpukpa	WEDNESDAY	NKWO	OCTOBER	19
29	Ikelebeji/ Ikolo Bioji	MONDAY	EKE	OCTOBER	24
30	Osisite Ugwunaobamkpa	FRIDAY	EKE	OCTOBER	28
31	Osisite Ezechima	SATURDAY	OYE	OCTOBER	29
32	Oruru Ani	TUESDAY	OYE	NOVEMBER	23
33	Oso Ekwulo	SUNDAY	OYE	DECEMBER	04
34	Iga Onicha	MONDAY	OYE	DECEMBER	12