Tachanot HaMidbar

B'nei Yisrael stopped at 42 different locations between Mitzraim and Eretz Yisrael, but only by some of them do we have a Mesorah as to what happened. I might fill in a few more later.

1. Sukkot - B'nei Yisrael are joined by the Erev Rav on the way to Sukkot (Shemot 12:37-38)
2. Eitam
3. Pi HaChirot
4. Marah
5. Eilim - There were 12 springs and 70 date trees (Shemot 16)
6. Yam Suf
7. Midbar Sin
8. Dofkah
9. Alush - They received the Man (Ba'al HaTurim 33:13)
10. Refidim - The war with Amalek (Shemot 17:8)
11. Midbar Sinai - Maamad Har Sinai, Chet HaEigel
12. Kivrot HaTa'avah - Recounted in BaMidbar chapter 11, includes the mitzvah to Moshe to appoint a Sanhedrin.
13. Chatzeirot - Lashon HaRa of Miriam (BaMidbar 12)
14. Ritmah - Sin of the Spies (Rashi to BaMidbar 33:18), Ma'apilim
15. Rimon Paretz
16. Livnah
17. Risah
18. Keheilatah - Ma'aseh Korach (Ba'al HaTurim to BaMidbar 33:22)
19. Har Shefer
20. Charadah
21. Makheilot - Ba'al HaTurim also relates this to Korach (per the girsah I have here), but perhaps it is referring to chapter 17:6 onwards, which is the day after Ma'aseh Korach.
22. Tachat
23. Tarach
24. Mitkah
25. Chashmonah - The 25th stop is Chashmonah, like Chashmonaim, hinting at Chanukah.
26. Moseirot
27. B'nei Ya'akan
28. Chor HaGidgad
29. Yotvatah - Devarim 10:8 says that at that time, Hashem separated the tribe of Levi for its work. According to (if I recall correctly) Rashi, this happened earlier, but the placement of this statement by this Tachanah nonetheless is relevant here.
30. Evronah
31. Etzyon Gaver
32. Kadesh - Death of Miriam, Moshe hits the rock (Bamidbar 20)
33. Hor HaHar - Death of Aharon, war with Melech Arad
34. Tzalmonah
35. Punon
36. Ovot
37. Iyei HaAvarim
38. Divon Gad
39. Almon Divlataymah
40. Harei HaAvarim
41. Arvot Moav - Maaseh Ba'al Pe'or (Bamidbar 25)
42. Har Nevo - Death of Moshe (Devarim 34)