英语邀请信结尾的万能句式可以根据不同的场合和情境进行选择，以下是一些常用的结尾句式：

表达祝愿

Best wishes! Best regards!

I hope everything goes well.

期待回复

Please write to me soon.

I am looking forward to hearing from you.

表达荣幸

We would be honored to have you join us at...

I am thrilled to invite you to...

It is my sincere pleasure to invite you to...

期待到来

We are excited to announce that we will be hosting...

（We are） looking forward to your coming.

I'm longing to see you soon.

I do hope that you can make it.

请求告知

Will you be available during that time？ Please contact me at xxx at your earliest convenience.

Would you please let me know as soon as possible if you can accept my invitation？

Would you please drop me a line to let me know if you can come？

正式场合

We sincerely hope you can join us and look forward to your favorable response.

We would feel much honored if you could come.

结合个人情感

I really hope you can make it.

My family and I would feel much honored if you could come.

这些句式可以根据具体的邀请内容和情境进行选择和调整，以确保邀请信既礼貌又真诚。