The address for the REU Conference site at Innovation Hall (IO building) on the IU Indianapolis campus is:
625 W. Michigan St.
Indianapolis, IN 46202
Here is a Google Map to the IO Building.
Here is a Campus Map
Please park in the Gateway Parking Garage (525 N. Blackford St.) that is located on the northeast corner of Michigan Street and Blackford Street. See this figure for a specific parking map. Parking permits will be available at check-in/breakfast. If you are a faculty member or student from Indiana University, please use your IU parking permit and park in the surface lot (EM/ST spots) directly south of the IO building.
The weather in Indianapolis in late July is quite warm. Typical daytime highs are generally in the 80s-90s. It occasionally rains, so remember to bring an umbrella.