You can repeat this questline as often as you want as long as you don't collect the last of the 8 vases required by quest. If you only collect 7 or fewer, you can rezone into Shard of Love: Weeding Corruption after a 30 minute lockout from the time you enter the zone. This zone is your best bet for collecting candies and love notes, they drop more plentifully here after killing mobs than in any other zone.
As well, if you mass pull/kill the four groups of four sprites on the terrace (shown in image below), you'll get a chance of a loot drop in the form of an appearance essence for the reforger. You do have to engage and kill all four groups of four wisps at once or it won't work.
This article refers to events, personae, items and activities only present in-game during the annual Erollisi Day festivities, which come to Norrath each year for a short time roughly around February 14th.