The latest Wizards of the Coast free Dungeons & Dragons download is available through the Stay at Home, Play at Home initiative. In D&D Adventurers League: In Dire Need, the players find themselves called to rescue a group of dwarves under siege. The 33 page adventure PDF is available for free at Dungeons Masters Guild through May 18th.
From WotC:
An expedition of dwarf warriors from Citadel Adbar finds itself isolated and besieged by Ice Spire ogres and their allies. They require immediate relief or they risk being destroyed to a dwarf.
SEER has directed you to their location in the hopes that you can rescue the dwarves and save their precious cargo, a tablet bearing secrets of ancient rune magic.
A Two-Hour Adventure for 5th-10th Level Characters