Even though Celly tends to be more associated with the summer and EQD is celebrating the day for /endpone/´s first mascot, I have also run into a few Celestia pics that give the impression of spring´s arrival, making her thematically related to this date.
Not a very common trait that you see from her (even though this board doesn´t seem to follow very common ideas, see the Bat Pony Cadence mascot or a handful of threads in the catalog) but it doesn´t prevent anything from getting some material where she can irradiate her beauty seamlessly.
These posts are also the first ones for her thread in 2021, so...well, this makes it a little bit more symbolic.
