'a portion of the event' is correct and usable in written English.
You can use it to refer to a specific part of a larger event or activity. For example, "I only attended a portion of the event, but I had a great time."
The economic value of the event, or a portion of the event, coming to New York is difficult to measure.
This video shows a portion of the event, including part of a discussion with President Ahtisaari regarding the final status for Kosovo.
Saturday's "Best of the West" session costs $125 per person and runs from 7 to 9 30 p.m. Gael Greene, the longtime restaurant critic who helped start Citymeals-on-Wheels, will be honored; a portion of the event proceeds will benefit the organization.
And there's more: a portion of the event proceeds will go to Partners in Health, a group that brings high-quality health care usually reserved for the rich to the poorest people in the world.
Julian Knowles, an extradition expert at the Matrix Chambers in London, says prosecutors only need to show that a portion of the events in a crime happened in the US and that there was an economic impact on the country: " They don't need much to jump on the bandwagon and demand the right to haul people over".
The two-minute video clip taken by a remotely piloted surveillance aircraft shows only a portion of the events that took place over roughly 90 minutes in the early evening, and it leaves many questions unanswered about where the Pakistani forces were and what they were doing when they were killed.
Consider possible avenues for making your cause or project the centre of attention for at least a portion of the whole event.
In the replicates for which the pre-bottleneck laboratory-cultured populations did not significantly depart from a mutation/drift equilibrium, an important assumption of the program Bottleneck, only a portion of the bottleneck events were detected.
This is much higher than the actual observed rate, implying that a portion of these events have been obscured from the Earth by interstellar dust.
The footage shows "merely a portion of these events," authorities said.
A portion of the proceeds of the event will benefit Gulf Coast hurricane relief organizations.
