A-319 Captain reported an electrical odor from the cabin during cruise. The aircraft diverted to an alternate airport and landed.

Narrative

While in cruise at FL330 and just south of ZZZ; the purser called the flight deck and originally reported smoke in the cabin. The FO answered this call while I was busy working through an arrival change with ATC. The FO interrupted my read back and informed me of the call from the cabin. I called the purser myself to gather more info. It was then clarified that it was an electrical odor emanating from rows 10-12; but no visible smoke was present in the cabin. While I was on this call with the cabin; ATC called back to ask 'Is everything alright?' Under my direction; the FO replied that we were addressing a maintenance issue. I elected not to declare an emergency quite yet; as I wanted to verify the validity of the claims of the odor. Multiple passengers and the other 2 flight attendants onboard also smelled the odor; but it was reportedly beginning to dissipate. While on the phone with the cabin; I sent dispatch a 'Call me ASAP' message to ascertain diversion airport information. The purser turned off what cabin equipment they could control in an effort to eliminate the source of the odor. We did not smell any odor in the flight deck at this time nor for the remainder of the flight; and we did not don our oxygen masks. We began referencing the Smoke/Fumes QRC; when we were able to reach dispatch on a frequency. After a very brief conversation with dispatch; I elected to divert to ZZZ1. I then [requested priority handling] with ATC; informed them of souls on board (113) and fuel remaining (~9;700lbs). We were given a descent; and eventually turned towards ZZZ1. I continued working to eliminate any source of the electrical odor. While I was working through the QRC; I proceeded to the Electrical Equipment Smoke/Fumes checklist; which had us turn on the emergency exit lights; turn off the Bus tie; isolate Bus 2 by turning off Gen 2 (causing the FO to lose his PFD and ND). I later realized that I missed several steps in the Smoke/Fumes QRC due to task saturation/forgot where I was in the checklist. I missed the ventilation blower and extract overrides; cab fans; and galley/cab switch. Of note; the seat belt sign was switch back on prior to descent.After the FOs instruments were lost; I assumed control of the aircraft. Somewhere during this fast sequence of events; I called both forward and aft galleys to provide the flight attendants with a briefing; though I was unsure how we were going to deplane; as I was unfamiliar with ZZZ1 ops and if they had a jet bridge or airstairs. The flight attendants reported the odor had mostly dissipated. I made a brief PA to the passengers to inform them of the diversion. As we got lower; we focused on the approach and landing at ZZZ1; leaving the non-normal checklists unfinished as our top priority was getting on the ground safely; and hearing reports that the odor dissipated provided some reassurance that our efforts to eliminate the source were successful. I informed the approach controller that we would exceed the 250kts below 10;000ft restriction. The rest of the approach and landing were not noteworthy.As we rolled out from landing; I instructed the FO to make a 'remain seated; remain seated' PA. We initially talked over to Gate XX; but changed to Gate XY. ARFF (Airport Rescue and Firefighting) equipment and personnel followed us to our Gate. After we parked and shutdown; I turned everything electrical off onboard the aircraft; except for the emergency exit lights; as I was still concerned that there may still be a fire/odor hazard given the reported nature of the odor.We encountered a serious safety threat once at the Gate. The gate agent has moved the jet bridge into position near the aircraft; but was refusing to open the aircraft door. I opened my flight deck window to talk to the gate agent; who said she could not open the door because 'Customs wasn't at the airport yet'. I reiterated we were an emergency aircraft and had fumes in the cabin. She said she would call the station manager. I called down to the ramp agents below asking for a supervisor; and was told the supervisor was on the jetbridge. I explained we were an emergency aircraft with fumes in the cabin; and that the aircraft door needed to be opened immediately. I firmly instructed gate agent again to open it; and explained that ARFF personnel needed to board the aircraft. By this time; ARFF personnel had arrived on the jetbridge and the aircraft door was opened. (I later spoke with the station manager regarding this issue to reaffirm our emergency status and that passenger/crew safety was paramount).All of the passengers and crew were rapidly deplaned; and I made one final sweep of the cabin (to include checking lavatories) before ARFF boarded the aircraft for an inspection. ARFF personnel stated they searched the overhead bins above rows 10-12 using thermal imaging; and do not note any hotspots. I explained that we have electrical outlets below the seats; and requested they inspect those too. Their inspection again returned no hotspots. ARFF personnel queried the crew if anyone wanted medical attention; and all 5 crew members declined. I asked the medical personnel to ask the passengers; and I was told they asked passengers as they deplaned and no passengers accepted such offer. After ARFF personnel cleared the aircraft; station ops helped coordinate allowing passengers to return to the aircraft in small groups (10-15 at a time) to retrieve their personal belongings and then clear US Customs.Two Chief Pilots were debriefed. The follow-up checklist was administered to myself and the FO; and we were put into rest to overnight in ZZZ1. Maintenance Control was contacted and debriefed to assist in accurately filing the logbook entries. Dispatch was also debriefed.A follow up phone call took place after the Chief Pilot contacted me and stated the FAA had asked about the usage of oxygen masks for the pilots and passengers. I reiterated that we did not utilize our masks; per the allowance in the QRC; as we did not detect any odors on the flight deck. I also stated that the passenger oxygen masks were not deployed; as we received word that the odor was dissipating and no passengers were complaining of difficulty breathing (additionally; a note in the flight manual states that passenger oxygen masks are 'not for use in smoke or fume environments').