H/T Jess Mears: 12News.com has a liveblog of last night’s debate which it sponsored along with the Sandra Day O’Connor Institue of four candidates running for Mayor of Phoenix, which according to 12News is the fifth largest city in the US. IIRC the position is non-partisan, but one of the candidates is Nicholas Sarwark, who is also current chair of the Libertarian National Committee. The other candidates are Kate Gallego, Moses Sanchez and Daniel Valenzuela. 12 News has a short profile of all the candidates here, but does not identify the party affiliation of any of the other candidates besides Nick. Gallego and Valenzuela are former Phoenix City Council members and Sanchez is a former Tempe Union High School District Board member. It appears that 3 of the 4 candidates have Latino surnames. The 12News facebook page has video of the full debate.
Update from Thane Eichenauer in comments: Phoenix city elections are not arranged by party. Moses Sanchez is identified elsewhere and on his signs as a Republican with the remaining two candidates being known Democrats.