Last year, we saw Tink and Vidia, but since then Tinkerbell has been moved by herself to the a Exhibition Hall at the front of the park.
If she is still appearing there alone during the day, I would expect her to be alone at the party too.
My DD and I were dressed as fairies for MNSSHP, so for us, it was a good use of time, even though the wait was long. They seemed to spend more time with each group and we had awesome interactions.