The invitation for the wedding and birthday celebration for the 90th birthday is a special and joyous occasion. It is a double celebration of love and life, bringing together family and friends to honor both milestones. The invitation likely includes details such as the date, time, and location of the event, as well as any special instructions or requests for RSVPs. It may also convey the significance of the occasion and the importance of having loved ones present to share in the festivities. **

A spontaneous birthday invitation can be seen as rude depending on the circumstances. If the person is close to you and understands that spontaneity is part of your personality, they may not find it rude. However, if the person prefers more notice for events and feels caught off guard by a last-minute invitation, they may perceive it as inconsiderate. It's always best to consider the preferences and feelings of the individual before extending a spontaneous invitation. **

A birthday invitation should include the name of the person celebrating their birthday, the date and time of the party, the location of the party, and any special instructions or requests, such as RSVP information or a dress code. It's also a good idea to include the reason for the celebration (e.g. "Join us to celebrate Sarah's 30th birthday!"). Additionally, you may want to include any specific activities or themes for the party so that guests can come prepared. **

When declining an invitation to a celebration, it's important to be polite and appreciative. You can thank the host for the invitation and express your regret that you won't be able to attend. It's also considerate to provide a brief explanation for why you can't make it, but you don't need to go into too much detail. You can offer to celebrate with the host at another time or send a small gift or card to show your appreciation. **

It is generally considered polite and respectful to attend a celebration only if one has been invited. Invitations are a way for the host to plan for the number of guests and to ensure that there is enough food and space for everyone. Showing up to a celebration without an invitation can put the host in an awkward position and may disrupt the event. It is always best to wait for an invitation before attending a celebration. **

To write a birthday invitation, follow these steps: 1. Start with a warm greeting, such as "You're invited to celebrate [Name]'s birthday!" 2. Include the important details: the date, time, and location of the party. Be sure to specify if it's a virtual or in-person event. 3. Mention any special instructions, such as a dress code or RSVP deadline. 4. Add a personal touch by including a fun or festive theme for the party, if applicable. 5. Consider including a brief itinerary of the party, such as activities, games, or special events planned. 6. End with a friendly closing, such as "We hope to see you there to celebrate with us!" 7. Don't forget to include contact information for RSVPs, whether it's a phone number, email address, or RSVP link. 8. Finally, proofread your invitation for any errors before sending it out to your guests. **

As an AI, I don't have the capability to accept invitations. However, if I were a human, my decision to accept a birthday invitation would depend on various factors such as my relationship with the person inviting me, my schedule, and the nature of the event. If the invitation aligns with my interests and availability, I would likely accept it to celebrate the special occasion with the person. **

When declining an invitation to a wedding celebration, it is important to be honest and express your gratitude for the invitation. You can politely decline by explaining your reason for not being able to attend, such as a prior commitment or scheduling conflict. It is also thoughtful to send a card or a small gift to the couple to show that you are still thinking of them on their special day. **