Both mangal aratrik and sundar aratrik can be changed according with sunrise and sunset. We are not concerned with the time, but with the sun's movement. Sundar aratrik may be performed one half to one hour after sunset. So the decoration of the temple room and offering Bhoga to the Deities should be done as nicely as possible as it is within our capacity. This is the sign of love. So I am confident of your love for Krsna and do everything nicely for His pleasure. Whenever it is necessary you are quite at liberty to ask me for direction.
These classes of Bhagavad-gita and Srimad-Bhagavatam as you are now holding must be continued very rigidly. About holding Sanskrit classes, the special stress should be given to chanting the mantras in our books. I have given specific instructions in this connection to your husband, and if Sanskrit class is to be held, it should be mainly for this purpose. We should simply expend our time for development of Krishna Consciousness. To become a scholar of Sanskrit is not our business. You say that 15 to 40 students are attending. Are they outsiders? My point is anyone who will attend the Sanskrit class must be interested for chanting the mantras (in our books Isopanisad, Bhagavad-gita, Srimad-Bhagavatam) and not for any other purpose. And before and after the class there must be Mahamantra chanting.
I am arranging how the Gayatri mantra should be given to the advanced students. You can simply let me know how many of our students are fit for this purpose. Unless one is strictly following the first initiation process and following the regulative principles, one should not be recommended for the Gayatri mantra.