I think that we all have memories of one day that was simply amazing and everything went smoothly.
It could be as simply as your first day fully dressed, or the day your SO accepted you.

For me, it was my 2014 birthday party.
Rented a nice house with a big patio for the event, bought lots of sparkling wine and food, setup a cool atmosphere by decorating the house a bit (and did all the decorations dressed of course) . Invited some friends over - all cds and SOs in this case - got a truly great makeover, chose a lovely and sexy dress, some amazing boots and got my wife at my side also all dressed up. Everyone was happy, it was very chill. Felt like a woman happy to be herself, having a great time.
Oh boy that one was hard on me when it was time to end... went to bed exhausted, but refused to take out clothes and everything (even boots! Ha!) just to cling to the feeling just a bit more.