Outside of the obvious, ‘To a Lolita meet-up or event’, I have 3 answers for this.
~First is a typical answer, to a Tea Party, High Tea or out to a nice luncheon at a pretty venue.
~Second is not as usual and needs the conditions to be right, a picnic.
~Third is a very practical one, which is–just at home for no particular ‘reason’ other than to please yourself. Practice putting outfits together, experiment with makeup and hair, get used to wearing your items if you aren’t already and take some snaps.