Olympic's epidemiological impact on Zika?
Though I have not found direct access to a model (which is what I'm really looking for), I have found evidence of such modeling efforts.

The CDC apparently put out a risk-assessment report in mid July discussing the results of such epidemiological modeling (reported by FivethirtyEight, ABC and others).

The report (available here), suggests that the risk of accelerated zika spread due to the 2016 Olympics is low. 

They cite two major reasons:


Low mosquito activity due to colder winter weather


and more importantly....


The number of increased visits to the Olympics will make up only a fraction of the number of people that travel to/from zika-affected countries on a regular basis.  


  The estimated 350,000 to 500,000 international visitors and athletes
  from 207 countries who are expected to travel to Rio de Janeiro for
  the 2016 Olympic and Paralympic Games represent a tiny fraction --
  0.25 percent -- of total travel to and from Zika-affected countries,   according to the CDC report.


According to CDC director Tom Frieden:


  "Compared with all travel to Zika-endemic areas, the Olympics account
  for about one-tenth of 1 percent of travel from the U.S. and globally
  about one-quarter of 1 percent, so even if Olympics didn’t exist,
  99.75 percent would be the same risk."



I will contact the CDC directly and ask for additional information regarding the model they used for this report. I will update this answer with any additional information I can gather. However, I'm sure others are producing similar models using different criteria, so please feel free to add additional examples or provide direct links to any available models.