Saudi Arabia has perhaps the closest cultural ties with Oman when it comes to make-up of the population regarding expatriates, a large size of land mass with various regional cultures and traditions across its expanse, and relatively comparative class system strucure when it comes to the economy and education of its citizens. I am sure if the parts of Saudi Arabia that used to belong to the Sultanate were still Omani and if Saudis in general didn't make Muslims worldwide smack their heads in woe at a horrible representation of Islam and how it treats women ect, that I'd not hear my Omani friends grimace at that description.
Now, as a tourist, I am absolutely certain most people, unless they are a Muslim heading to Mecca and Madinah on a holy pilgrimage, have never entertained the idea of travelling to Saudi Arabia for the purposes of tourism. But for the more adventuress, it can be done, and is often rewarding, because Saudis in general find the very rare traveller to be a person to be regarded with kind curiousity. At least, in my experience, Europeans and Westerners in general.
Saudi Arabia's equivelent to Muscat festival, called The Janadriyah Cultural Heritage Festival, I encourage people to get to know Saudis before forming an opinion of them. Same as I encourage people to get to know real Omanis who uphold Omani culture and heritage ect.
Witnessing a culture that only a very hardy traveller can adventure through to make it to is one of those dying arts, living in such a highly globalized world.
Travelling to the festival:
*advance visas are required for all foreigners desiring to enter. The only significant exception is citizens of the Gulf Cooperation Council nations, usch as Omani nationals. Nationals of Israel and those with evidence of visiting Israel will be denied. To attempt to apply for one or at least be directed to where to do so, I suggest dressing modestly in an abaya and a headscarf for women, or just plain old modestly for a guy, and visit the saudi Embassy here in Oman during their working hours which are generally the same as any government building in Oman. They tend to be really friendly at the saudi embassy here in Muscat, as opposed to phoning what would be considered the proper authorities. If I can get more defined information for y'all I will add it. I am thinking of going to the festival myself next year.
*Do not tick off "atheist" or "jewish" on your visa application if you can help it if you want to be assured of your request being accepted. Many other entry requirements, such as a dress code of arms and legs covered for men, and black abaya for women, and restrictions on unaccompanied females, still apply. As it is difficult for women who are unmarried to travel and are forbidden to drive I suggest travelling here with your husband or if you have a female friend living within Saudi who can arrange you visa, hotel, and transportation. That's why I said for the more determined adventuress types;).
For my Arabic-literate readers the festivals own webpage: http://www.janadria.org.sa/sites/main/ar/Pages/default.aspx
For english-readers although I cannot claim to know how up to date or legit this site it (I'll ask the KSA embassy first): http://www.sauditourism.com.sa/en/provinces/news.aspx?NewsID=6#