I think our birthdays (and/or our rebirth-days!) might be celebrated in the new heaven and the new earth. There is no night …
Its gates shall not be shut at all by day (there shall be no night there).
Revelation 21:25 NKJV
… but there are months, and apparently, years!
And he showed me a pure river of water of life, clear as crystal, proceeding from the throne of God and of the Lamb. 2 In the middle of its street, and on either side of the river, was the tree of life, which bore twelve fruits, each tree yielding its fruit every month. The leaves of the tree were for the healing of the nations. 3 And there shall be no more curse, but the throne of God and of the Lamb shall be in it, and His servants shall serve Him.
Revelation 22:1-3 NKJV
25 “Of old You laid the foundation of the earth,
And the heavens are the work of Your hands.
26 They will perish, but You will endure;
Yes, they will all grow old like a garment;
Like a cloak You will change them,
And they will be changed.
27 But You are the same,
And Your years will have no end.
28 The children of Your servants will continue,
And their descendants will be established before You.”
Psalms 102:25-28 NKJV
9 But as it is written:
“Eye has not seen, nor ear heard,
Nor have entered into the heart of man
The things which God has prepared for those who love Him.”
10 But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God.
1 Corinthians 2:9-10 NKJV
You will show me the path of life;
In Your presence is fullness of joy;
At Your right hand are pleasures forevermore.
Psalm 16:11 NKJV
So why not birthday, rebirth-day, or may be even conception day celebrations? During Jesus’ 1000-year earthly reign at least one feast is celebrated every year.
16 And it shall come to pass that everyone who is left of all the nations which came against Jerusalem shall go up from year to year to worship the King, the Lord of hosts, and to keep the Feast of Tabernacles. 17 And it shall be that whichever of the families of the earth do not come up to Jerusalem to worship the King, the Lord of hosts, on them there will be no rain. 18 If the family of Egypt will not come up and enter in, they shall have no rain; they shall receive the plague with which the Lord strikes the nations who do not come up to keep the Feast of Tabernacles.
Zechariah 14:16-18 NKJV
I think the new heaven and earth is going to be a rejoicing, happy, glorious place. You are invited. Make sure you make it!
Jesus is coming soon. Be ready to meet Him!
32 “Now learn this parable from the fig tree: When its branch has already become tender and puts forth leaves, you know that summer is near. 33 So you also, when you see all these things, know that it is near—at the doors! 34 Assuredly, I say to you, this generation will by no means pass away till all these things take place. 35 Heaven and earth will pass away, but My words will by no means pass away.”
Matthew 24:32-35 NKJV
34 “But take heed to yourselves, lest your hearts be weighed down with carousing, drunkenness, and cares of this life, and that Day come on you unexpectedly. 35 For it will come as a snare on all those who dwell on the face of the whole earth. 36 Watch therefore, and pray always that you may be counted worthy to escape all these things that will come to pass, and to stand before the Son of Man.”
Luke 21:34-36 NKJV