I am sure this wedding will have implications to your tax life, immigration, census etc. Therefore, I would recommend you to apply for marriage license in the state where marriage ceremony will be performed before completing the matrimonial rituals. If the pundit, you gonna pick for the rituals, has license from the state of CA,  that should make his signature validation on your marriage license legal. If you have trouble finding Nepali pundit you could go with Hindu Pundit of Indian Origin available in your locality

For Catering and Pundit you might wanna contact Indian Caterers at Sulekha.com. Any of those caterers should be able to recommend you a pundit too. And yes, if you wanna have the reception in a hotel banquet room, you might be able to find a hotel/inn in your area that serves Indian food since a lot of Inns/motels are run by Indians.

Congrats on your upcoming marriage and enjoy your wife.