The Islamic Society of North America wanted to give people a chance to learn about the religion.
The hateful and vulgar messages that were spray painted on the mosque have long since been removed, but the actions of the vandals have not been forgotten.
It is the hope of the Islamic Society of North America that Saturday's open house will not only answer questions that people may have about Muslims and their religion, but to help members realize the community is accepting of different faiths.
"We want them to come out and say, 'You know what? Our mosque is still here, we have a lot of people that love us and came out to support us,'" Hazam Bata said.
"I'm so glad they're willing to share stuff and let us know a little bit more about themselves," Kyla Maloney said.
Hundreds of people attended the event which featured art, food, a look at some religious and historical items, as well as a tour of the mosque.
Plainfield police say they, along with the FBI, are still investigating the case, which is considered to be a hate crime.