In the Skanda Purana there is the following description of the result of seeing aratrika (worship) of the Deity: "If someone sees the face of the Lord while aratrika is going on, he can be relieved of all sinful reactions coming from many, many thousands and millions of years past. He is even excused from the killing of a brahmana or similar prohibited activities.
As we have already explained, there are different ceremonies to be observed, such as the birthday of Krsna, the birthday of Lord Ramacandra, the birthday of some prominent Vaisnavas, the ceremony of Jhulan-yatra with the Lord sitting on a swing, Dola-yatra (the Lord's activities in the month of March), and so on. In all festivals the Lord is seated on a car, and the car moves through different streets of the city so that people may take advantage of visiting the Lord. In the Bhavisya Purana it is said: "In such a ceremony, if even a candala [dog-eater], simply out of curiosity, sees the Lord on the cart, he becomes counted as one of the associates of Visnu."
In the Garuda Purana it is stated: "Any person who in gladness sees the worship of the Deity in the temple will obtain the results of kriya-yoga which are described in the Pancaratra scripture." Kriya-yoga is a system of practice much like practical devotional service, but it is especially meant for the mystic yogis. In other words, by this gradual process, the mystic yogis are eventually elevated to the devotional service of the Lord.