Must have Minecraft: Bedrock Edition
To claim your freebies. First open Minecraft, go to Marketplace, then Summer Celebration, the banner should show up, and click view gifts
If you miss a day, don’t worry. you can still claim previous days Until July 17, 2023, 01:00 +08:00 GMT
Day 01 Archaelogist & Timeless Trails By Minecraft - Character Creator & 1 World
Day 02 Archaelogist Trousers By Minecraft - Character Creator
Day 03 Bamboo Crown By Minecraft - Character Creator
Day 04 Bamboo Hoodie By Minecraft - Character Creator
Day 05 Bamboo Trainers By Minecraft - Character Creator
Day 06 Cherry Tree Headband By Minecraft - Character Creator
Day 07 Cherry Tree Robe By Minecraft - Character Creator & 1 World
Day 08 Cherry Tree Wings By Minecraft - Character Creator
Day 09 Potted Torchflower By Minecraft - Character Creator
Day 10 Sniffer Beak By Minecraft - Character Creator
Day 11 Sniffer Ears By Minecraft - Character Creator
Day 12 Sniffer Onesie By Minecraft - Character Creator
Day 13 Terracotta Jumper By Minecraft - Character Creator
Day 14 Torchflower Robe By Minecraft - Character Creator
Sources:
https://www.minecraft.net/en-us/article/the-summer-celebration-sale-has-begun