If it is a one-time event done in real time, then use index cards and colored markers. The only reason to bother with computer entry is if you need to have an historical record or are going to repat the same event again.
We volunteers are coming together to put on a 3 day event.
We will not be seeing each other until 3 days before the event, and we are coming in from various locations in New England.
To put size into perspective, we expect 60 thousand to attend over 3 days of the event.