Conversation so far:
where did tradition of giving gifts come from
In ancient Rome, gift giving may have occurred near the winter solstice which in Europe occurs in December. This was celebrated during the Saturnalia holiday, which took place that month.
what did saturnalia celebrate
Saturnalia was an ancient Roman festival in honour of the god Saturn.

Question: when was the festival held
Self-contained rewrite: when was saturnalia held