1. Determine the theme: First, you need to choose a theme for your opening ceremony. The theme should reflect the character and style of your hotel.

2. Make a plan: Once you determine the topic, you need to make a detailed plan. This plan should include the date, time, location of the event, and a list of guests you want to invite.

3. Budget: You need to create a budget for your grand opening. This budget should include venue rental, decoration, food and drink, entertainment, etc.

4. Decoration: According to your theme, you need to purchase corresponding decorative items. This may include balloons, banners, flowers, etc.

5. Food and Drinks: You need to prepare enough food and drinks to satisfy all the guests. You can choose buffet style or offer a la carte dishes.

6. Entertainment: You can invite a band or DJ to provide music for your opening ceremony. You can also arrange some games or performances to attract your guests' attention.

7. Publicity: You need to promote your opening through various methods, including social media, emails, flyers, etc.

8. Invitation letter: You need to design and send invitation letter to the guests you want to invite. The invitation should include the date, time, location of the grand opening, and RSVP information.

9. Confirm the number of attendees: Before the opening ceremony, you need to confirm the number of people you can accommodate so that you can prepare enough food and drinks.

10. Finally, make sure all staff know their responsibilities and have enough time to prepare.