So my typical formula works partially.

Local StringVar Dates := '';

if Not IsNull({eloans_csv.InfVenueStartDate0}) or Not IsNull({eloans_csv.InfVenueEndDate0}) then
(
    if Not IsNull({eloans_csv.InfVenueStartDate0}) then
        Dates := {eloans_csv.InfVenueStartDate0};
    if Not IsNull({eloans_csv.InfVenueEndDate0}) then
    (
        if Dates <> '' then
            Dates := Dates + " - " + {eloans_csv.InfVenueEndDate0}
        else
            Dates := {eloans_csv.InfVenueEndDate0};
    )
)

It repeats the information for each venue then.