The 2-year Tourism Board Budget is $35,000,000, or approximately $17,500,000 per year, per page 24 of their strategic plan.  These revenues are generated from the 1% statewide lodging tax.  Reading through their prior budget years, it appears 5% annual growth is conservative (it's been much much higher the past 10 years).  If they increase the lodging tax by .8% for 4 years, they will increase the revenues by 80% for 4 years.    That means in year 1, they will raise $14,700,000 (80% of $18,375,000).  In year 2, the new tax will raise $15,435,000 (80% of $19,293,750).  Then $16M in year 3 and $17M in year 4. In 4 years, the new tax raises $63,358,838.  More than enough for a track event ($25M).   It's not surprising that Nathanson nor Edwards submitted any revenue projections or cash flow projections---this tax will raise a ton of money.  

http://industry.traveloregon.com/content/uploads/2015/06/TravelOregonStrategicPlan2015-2017.pdf