I want to invite Guanyin Bodhisattva. What time?

Anytime and anywhere. If we must pay attention to it, the fifteenth day of the first day will do. You should know that all Buddhas and Bodhisattvas have great achievements, great compassion and boundless magic. If you need to worship, place, move and clean, you don't need to choose a date, choose a time, look at Feng Shui and set the direction. There is no limit to "one Buddha breaks all evils".