in annual dinner vs on annual dinner

Some examples from the web:

• The Blood Sand Society have graciously invited me to their 12th annual dinner.
• And then $25,000 to each celebrity That attends the annual dinner at the institute.
• We land at 4:00, then there's a drop-by at the Teachers Union cocktail party... before their annual dinner at the Sheraton.
• A night of mischievous criminal behavior, which is why every year at this time, Mr. March holds his annual dinner event.
• Besides, tonight is our annual leftover dinner.
• Also, First Baptist is having their annual Panther dinner on Thursday night, so you'll be there.
• Tonight, the North Yorkshire Carbon Management and Sustainability Trust are holding their annual conference and dinner at Broughton Hall, five miles from here.
• Elise Vogelsong welcomes foreign dignitaries to the annual Vogelsong Foundation dinner, wearing the renowned and priceless Vogelsong Medal.
• My brothers - along with their wives, children and grandchildren - had gathered here for our loathsome annual board meeting and dinner.
• As I'm sure you're aware his reputation is without peer, and Dr Meinheimer will present his recommendations to the annual national press club dinner...
• "Meeting of minds at the Annual Business Achievement Awards dinner."
• Anyhoo, I just thought I'd mosey on over here, invite you all to Greendale's annual Thanks-living potluck dinner, where we remember all we have to be thankful for.
• Thereafter amount specified in annual finance laws.
• The ongoing deceleration in annual M3 growth has continued to be accompanied by a strengthening in annual M1 growth, which in August rose further to 13.6%.
• Assimilation and simplificiation thresholds shall be expressed in annual values of intra-Community trade operations.
• Budgetary commitments for the Galileo and EGNOS programmes shall be appropriated in annual instalments.
• That's $12 million in annual earnings.
• The Asian market represents upwards of $70 million in annual revenue for the brand.
• This data should be also included in annual reports of Eurojust.
• Budgetary commitments for the programmes shall be appropriated in annual instalments.

Some examples from the web:

• The Blood Sand Society have graciously invited me to their 12th annual dinner.
• And then $25,000 to each celebrity That attends the annual dinner at the institute.
• We land at 4:00, then there's a drop-by at the Teachers Union cocktail party... before their annual dinner at the Sheraton.
• A night of mischievous criminal behavior, which is why every year at this time, Mr. March holds his annual dinner event.
• Besides, tonight is our annual leftover dinner.
• Also, First Baptist is having their annual Panther dinner on Thursday night, so you'll be there.
• Tonight, the North Yorkshire Carbon Management and Sustainability Trust are holding their annual conference and dinner at Broughton Hall, five miles from here.
• Elise Vogelsong welcomes foreign dignitaries to the annual Vogelsong Foundation dinner, wearing the renowned and priceless Vogelsong Medal.
• My brothers - along with their wives, children and grandchildren - had gathered here for our loathsome annual board meeting and dinner.
• As I'm sure you're aware his reputation is without peer, and Dr Meinheimer will present his recommendations to the annual national press club dinner...
• "Meeting of minds at the Annual Business Achievement Awards dinner."
• Anyhoo, I just thought I'd mosey on over here, invite you all to Greendale's annual Thanks-living potluck dinner, where we remember all we have to be thankful for.
• It is the responsability of the Budgetary Authority to decide on annual appropriations.
• Second, there should be a greater focus on annual monitoring of the implementation of guidelines.
• Based on annual average inflation rates in 1999-2003.
• The Member States are therefore still responsible for reporting the data on annual emissions.
• The Commission will report on annual basis on progress made.
• The Council should exercise more political oversight over the agencies, for example, by drawing conclusions on annual reports.
• The information on annual activities is largely for the ECB's external stakeholders.
• The Commission shall adopt its decision on annual appropriations in compliance with the prerogatives of the budgetary authority.