Group 1 - The celestial events in May include the opposition of Ceres and Vesta, the close approach of Mars to the Beehive Cluster, the peak of the Eta Aquarids meteor shower, and the "disappearance" of Saturn's rings [1][2] - Ceres and Vesta, the fourth and third discovered asteroids respectively, will have their oppositions on May 2 and May 15, providing optimal viewing opportunities for the public with telescopes [1] - The Eta Aquarids meteor shower is expected to peak on May 6, with a zenithal hourly rate (ZHR) of around 50, and favorable viewing conditions due to the absence of moonlight [1] Group 2 - Mars will pass through the center of the Beehive Cluster (M44) from May 3 to 6, with the best viewing opportunities on the nights of May 4 and 5 [2] - Saturn's rings appeared to "disappear" on March 24 due to the angle of observation, but on May 7, the rings will be illuminated from the side, potentially appearing dimmer [2][3] - The "star and moon fairy tale" events include a crescent moon meeting Saturn and Neptune on May 23, and a meeting with bright Venus on May 24, followed by a meeting with Jupiter on May 28 [3]