Update: The location of the ice cream social was moved indoors due to bad weather. The event will be held at the Robert A. Lee Community Recreation Center, 220 S Gilbert St. Other details have not changed.

This year, a common complaint lobbed into the proverbial pool of 2020 candidates is that they are too alike to tell the difference. But in fact, if you squint, certain substantive issues begin to stand out.

Some hope to drum up support among Iowa's African-American communities. Some have been running since 2017. One even pledged to give an Iowa Falls family $1,000 a month for the next year.

One non-substantive difference is that only Vermont Sen. Bernie Sanders has his own Ben & Jerry's flavor, originally launched during his 2016 campaign: Bernie's Yearning, which consists of mint ice cream with a chocolate disk on top. This chocolate disk — which makes up approximately the top 1% of the pint — is meant to be broken up into the rest of the ice cream.

Get it?

On Tuesday, Bernie Sanders will hold an ice cream social in hopes of connecting residents with his campaign. Doors open at 6 p.m. The event starts at 7 p.m. at College Green Park, 600 E College St.

This month, the Sanders campaign is opening offices in eight cities across Iowa: Ames, Cedar Rapids, Council Bluffs, Davenport, Sioux City, Ottumwa, Waterloo, and beginning Wednesday, Iowa City. The campaign headquarters opened in Des Moines earlier this year. The Iowa City office will be located at 1745 Boyrum St.

Related: Bernie Sanders comes to the University of Iowa to rekindle 2016 burn.

Roger Oullette, the Iowa communications director for the Sanders campaign, said that he will be taking questions from the public. To sweeten the deal, Oullette said, "If it helps get people in the door, it is Ben & Jerry's ice cream."

The Des Moines Register is keeping a detailed list of upcoming 2020 presidential candidate events. The candidate tracker can be found online.

Tuesday, July 2

Iowa City: Bernie Sanders ice cream social at 7 p.m. at College Green Park, 600 E College St.

Ottumwa: Amy Klobuchar meet and greet at 2 p.m. at Hotel Ottumwa (Blackhawk Room), 107 2nd St. E.

Wednesday, July 3

Muscatine: Amy Klobuchar meet and greet at 11 a.m. at Missipi Brewing Company, 107 Iowa Ave.

Waterloo: Tim Ryan meet and greet at 11:30 a.m. at UNI Techworks, 360 Westfield Ave.

Iowa City: Bernie Sanders opens field office at noon at 1745 Boyrum St.

Waterloo: Joe Biden meet and greet at 5:30 p.m. at UAW 838, 2615 Washington St.

Thursday, July 4

Cedar Rapids: Steve Bullock in Fifth Season 5k Race at 8:15 a.m. which starts and ends at the Cedar Rapids Museum of Art, 410 3rd Ave. SE.

Clinton: Steve Bullock in Clinton Parade at 1 p.m.

Clinton: Steve Bullock meet and greet at 2:15 p.m. at Clinton County Democratic Headquarters, 224 22nd Pl.

Friday, July 5

Cedar Rapids: Joe Sestak meet and greet at 10 to 11 a.m. at the Cedar Rapids Public Library, 450 5th Ave. SE.

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Zachary Oren Smith writes about government, growth and development for the Press-Citizen. Reach him at zsmith@press-citizen.com or 319-339-7354, and follow him on Twitter @zacharyos.