How to invite Buddha for his birthday?

Just respect it. People who say "no" are all confused by folk customs or superstitions, even blind to Buddhism (Buddhism is limited to hearsay, in fact, there are no monks to explain the principles of Buddhism for him, and no one to participate in Buddhist practice).

Besides, these are just forms, not important. What matters is the heart! Respect and sincerity are the most important things. The so-called "sincerity is the spirit" means this.

Secondly, buddhas and bodhisattvas are great achievers, with great compassion and boundless magical powers. 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".