I was out to Pioneers Park with the Olli group this week, but as most of the group do not do eBird yet, I submitted a short incomplete list that day. There were two birds at the back of one pond. I went back and took a couple of photos. I mistakenly called the one pectoral sandpiper. It was a solitary sandpiper, which I have seen there before. The dangers of calling a bird from a small view on the back of a camera. The list is correct now:
It was more birds than I expected. But some just a few years apart. Last pectoral was 2004. In 2014 some people reported a willet and there was talk of one May 2. Hiowever, nobody posted it. It was the right time for willets as I saw them elsewhere.
If you Olli class just made a personal list based on my pectoral, it would be best to take it out.