At present, hotels usually provide overall planning and layout services, including wedding venue layout, wedding catering, wedding hosting, wedding photography and other related services, and guests are not allowed to build rainbow doors by themselves.

This is mainly due to the following reasons:

1. Venue coordination: As a professional wedding planning and service organization, the hotel will coordinate and arrange according to the size, shape and decoration style of the wedding venue. As a temporary decoration, the rainbow door may not be in harmony with the hotel's layout style and venue size, which will affect the overall effect of the wedding.

2. Safety considerations: Rainbow doors usually need to be made of steel pipes, balloons and other materials, but the safety of these materials cannot be guaranteed. In order to ensure the safety of the couple and guests during the wedding, the hotel does not allow guests to build rainbow doors without permission.

3. service quality: the overall planning and layout service provided by the hotel is to ensure the overall effect and quality of the wedding. If guests are allowed to build their own rainbow doors, it may affect the overall coordination and aesthetics of the wedding, thus affecting the quality of service.

Therefore, when choosing a hotel, it is recommended that the couple know the layout and service items of the hotel in advance, and try to communicate and negotiate with the hotel to ensure the overall effect and quality of the wedding.