So far as the bowing down in Deity worship, before opening the door you should bow down. Then turn on the light and bow down again. There is no restriction on bowing down. As many times as you can is all right. Of course, your clothes and under garments should always be as clean as possible. Guests and devotees need not be wearing woolen robes to be dancing around the deities. Regarding your question about guests being present at arati, you should have as many guests there as is possible for you to get to come.
Regarding your question about guests being present at arati...
Correspondence
1969 Correspondence
You should have as many guests there as is possible for you to get to come.
Letter to Hamsaduta -- Los Angeles 21 February, 1969: