| 1989 | Aug. 28 | The LA Hanmi Opera Company Founded |
| Dec. 12 | Opera Performance “Esther” | |
| 1990 | Aug. 25 | Opera Performance Mozart’s “Requiem” |
| 1991 | Jun. 24 | LA Hanmi Opera Youth Choir Founded |
| Dec. 1 | Opera Performance “Amahl and the Night Visitors” | |
| 1992 | Nov. 10 | Opera Performance “La Boheme” with Torrance Symphony Orchestra |
| 1993 | Nov. 11 | “Opera Festival” with Amara Symphony |
| 1994 | Sept. 25 | The 16th Interdenominational Festival of Sacred Music |
| 1995 | Jul. 15 | The 4th LA Hanmi Opera Youth Choir Musical Performance “Colby” |
| 1996 | Feb. 2-4 | Opera Performance “La Traviata” |
| 1997 | Mar. | Opera Performance “Le Nozze Di Figaro” |
| Oct. | The name of LA Hanmi Opera was changed to Opera California | |
| 1998 | Apr. | Awarded a grant from National Endowmentfor the Arts (NEA) |
| 1999 | May. 23 | Participation of “International Choir Festival” |
| July | Awarded a grant from LA Country Arts Commission | |
| 2000 | Jan. 8 | African-American Outreach Performance”Martin Luther King’s Day Celebration” |
| Mar. 3 | Jewish-American Outreach Performance atKol Tik Vah, Woodland Hills | |
| 2001 | Dec. 2-3 | Opera Performance “Amahl and the Night Visitors” |
| 2002 | Jun. 18 | Rwanda Children Support Concert |
| 2003 | Dec. | Multi-ethnic Women’s Choir Handel’s “Messiah” Concert |
| 2004 | Jun. 13 | African Missions Fund-raising Concert |
| 2005 | Jul. 16 | Annual Opera California Youth Choir (OCYC)Musical Performance, “Father Knows Best” |
| 2006 | May | OCYC’s 6th Album “Jesus Loves Me” Released |
| 2007 | Aug. 10-20 | OCYC Peru Missions Trip |
| 2008 | Jul. 19 | The 24th OCYC Musical Performance”In God’s Time” |
| 2009 | Aug. 18 | The 25th OCYC Musical Performance “Gifted” |
| 2010 | Jul. 17 | The 26th OCYC Musical Performance “Dreams” |
| 2011 | Jul. 16 | The 27th OCYC Musical Performance”We Are The World” |
| 2012 | Sep. 29 | Multi-ethnic LA Community “Messiah” Concert at MacArthur Park |
| 2013 | Oct. 16 | The world premiere performance of Handel’s “Messiah” by 2013 Women Choir from US and Korea |
| 2014 | Jul. 25-30 | OCYC Mexico Missions Trip |
| 2015 | Dec. 19 | Hmong Charity Concert |
| 2016 | Jul. 9 | The 32nd OCYC Musical Performance “The Sign 2” |
| 2017 | Nov. 11 | Opera Performance “Amahl and the Night Visitors” |
| 2018 | Jul. | Opera Performance of “Amahl and the Night Visitors” in Korea (Tour Planned) |