Kalakshepam means spending time meaningfully. Kalakshepam is to spend time effectively in understanding the Srisukti-s of our Purvacharya-s and to have a clear grasp of the Granthams.
Samashrayanam is an important eligibility to attend Kalakshepam. Those who have done Samashrayanam and Bharanyasam should undergo Kalkshepam from an Acarya as per the rules.