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Moveable feasts during August and September include Oktoberfest, a two-week celebration beginning in late September and ending on the first Sunday in October (Munich, Germany,) and Schafer Sonntag, the 2nd sun in September (Switzerland.)

In Northern Tradition Pagan and some Lokean sects, Loki’s Day is on the heliacal rising of Sirius. It precesses 1 day every 4 years. It moves from August 8th to August 9th in 2019. The Lokean sects that dedicate July for Loki began doing so when the heliacal rising of Sirius took place in July.

August

1
Freyfaxi (American Asatru),
Haustblot (American Asatru),
Loaf-Fest (American Asatru),
Liðasblót (American Asatru),
Elben Segen (German Reconstructionist)

9
Day of Radbod King of the Frisians (American Asatru, American Odinist),
Loki Day (Northern Tradition, Lokean)

15
Month of possible date of Hoietfescht ends (Urglaawe)

21
Hlafmaest (Theod)

23
Schaferlauf begins (Swabian Germany) 

25
Schaferlauf ends (Swabian Germany)

28
Freyfaxi (American Odinist)

September

1
season of possible date of Almabtrieb begins (Germany)

9
Day of Herman the Cheruscan (American Asatru, American Odinist),
Day of Queen Sigrid of Sweden (American Asatru)

22
Winter Finding (American Asatru),
Vetrablot (American Asatru),
Harvest Home (Urglaawe),
Erntfescht (Urglaawe),
Erntedankfest (Germany)

Oktoberfest begins (Munich, Germany) 

28
Zisasege (Urglaawe)

30
season of possible date of Almabtrieb ends (Germany)

Maienzug (Aarau, Switzerland) takes place every year on the first Friday in July. It's an example of a moveable feast, that is, a holiday that is not on the same date every year. The following is a list of holidays with fixed dates which are celebrated by heathens or heathen-derived cultures.

June
8
Lindisfarne Day (American Asatru, American Odinist)

9
Day of Sigurd (American Asatru, American Odinist)

21
Midsummer (Urglaawe, England),
Hleifblot (American Asatru),
Líða (Theod),
Mittesommer (Germany),
Sommersonnewende (Germany),
Hochsommer Fest (Switzerland),
Midsommar (Norway),
Midsommardagen (Sweden)   

July
7
Lindenfest begins (Geisenheim, Germany)

9
Day of Unn the Deep-Minded (American Asatru), Lindenfest ends (Geisenheim, Germany)

15 Month of possible date of Hoietfescht begins (Urglaawe)

29 Stikkelstad Day (American Asatru)

31 Month of possible date of Honoring of the Weisskeppichi Fraa ends (Urglaawe)

Some moveable feasts require knowing the date of other feasts to derive their dates. Pinkster is on the fiftieth day after Easter, aka Whitsunday (in Deventer, province of Overijssel, Netherlands)
Pinkster Bruid or Pinksterbloem on Whit Tuesday (in Volte, Ootmarsum, Markelo, Rijssen, Hellendoorn, Hengelo, and other communities, province of Overijssel, Netherlands.)

April 1: Loki Day. Loki's Day is celebrated on April 1st by American Asatru groups and individuals influenced by the old Ostara festival held by the old Ring of Troth, which was a multi day campout that included April 1st when that date fell on a weekend. Loki Day was a day for pranks and jokes in honor of Loki, and toward the end of the RoT women who were awake in the early morning threw their hair-combings into the fire for Loki. When the Ring of Troth broke into two groups, the American Vinland Association kept the Loki celebrations intact, while over the years the Ring of Troth abandoned them due to the influence of new members who were Nokeans (see my post on Nokeans for a definition and discussion.) The Troth recently re-embraced Loki, so the old custom may or may not come back. Also on April 1st: Narrentag (Germany, Austria, Switzerland) and the season of the possible date of Alp Aufzug begins (Switzerland.)

9 Day of Haakon Sigurdson (American Asatru, American Odinist)

14 Flyttedag, Faredag (Norway)

15 Sechseläuten (Zurich, Switzerland)

21 Sigrblot (Asatru)

22 Yggdrasil Day (American Asatru)

30

Valpurgisnacht (American Asatru),
May Eve (American Asatru, England),
Walpurgisnacht / Wonnenacht (Urglaawe), Wonnezeit begins (Urglaawe),
Walpurgisnacht (Germany, Austria, Switzerland),
Valborgsmässoafton (Sweden)
Valborgsnatten (Norway),
Maitag Vorabend (Switzerland),
Valborgsaften (Jutland, Denmark) 

May

No, Ash Wednesday is not a heathen or pagan holiday. Yes, Wednesday is named after Odin (Woden.) Yes, other cultures besides Christianity used ritual fire and some even used ritual ash. Some Hindus in India receive a blessing from ash from a sacred fire. Fire as a source of cleansing, heat, and light is pretty basic and obvious, and the fact that x culture used it does not mean y culture stole the idea from x culture.

The internet meme making the rounds that claims that fire and ash is an exclusively heathen or pagan symbol is ridiculous on its face; all cultures used fire. The internet meme claims the ashes from heathen festivals were protective in heathen culture. While it is possible that some heathens in the past did use ash for some magical or religious purpose, but if so the person who created the meme really ought to cite the source.

Most modern Pagans are familiar with the eightfold Wheel of the Year: the solstices and equinoxes and the points halfway in between.

But that's a modern construct, perfectly valid, just not something that goes back to the Bronze Age Mediterranean. It also doesn't match the unique seasons of the Mediterranean region, where Crete is located (and where the Minoans lived).

Many heathen sects celebrate some version of Groundhog Day and Easter.

The 12 days of Entschtanning in the Urglaawe tradition (Pennsylvania Deitsch) run from the 1st to the 12th of February. On the 1st of February, German Reconstructionists in the USA celebrate Idisi Segen.

February 2nd is Groundhog Day, Charming of the Plough, Idis-thing, Disting, and Barri to different groups among American Asatru. It's also Candlemas (English), Lichtmess (Austria, Germany, Switzerland), and Lichtmesdag (Luxembourg.)

Some American Asatruars have invented a holiday to be celebrated while mainstream American culture is celebrating Valentine's Day on Feb. 14th. This holiday is variously called Vali's Day, Freya's Day, or just the Fourteenth of February (similar to the custom in Denmark where it is called Fjortende Februar rather than St. Valentine's.)

Heathenry includes many different traditions. Most major heathen sects derive their holidays from a specific country, time period, and / or language, but American Asatru tends to be more eclectic because its members tend to be of various ethnicities. Even when trying to replicate Icelandic Asatru holidays, American Asatru sometimes sets them on different dates due to different methods of calculation. Iceland celebrates Þorrablót on the Friday after the 9th of January. American Asatru celebrates Thurseblot on the full moon of January.

Each of the many heathen peoples of history had their own calendar system, and calculating modern dates for ancient holidays requires not only knowing what date the celebration was actually held-- which isn't always completely obvious from the available evidence-- but also doing the math to convert the old calendar system to our new one, often with a stop midway into the Julian calendar because correspondences between it and various ancient calendars are sometimes provided in written lore.

One of the many ancient calendars was the metonic calendar, which is now used by Theod, a heathen sect based on Anglo-Saxon culture. The metonic calendar months for 2019 are:

Æftera-Geól Jan. 8 – Feb. 5
Súlmónað Feb.6 – March 7
Hréðmónað March 8 – April 6
Éosturmónað April 7 – May 5
Þrimilci May 6 – June 4
Ærre-Líða June 5 – July 3
Æftera-Líða July 4 – Aug 2
Weodmónað AUg. 3 – Aug. 31
Háligmónað sept. 1 – Sept. 29
Winterfylleð Sept.30 – Oct. 29
Blótmónað Oct.30 – Nov. 27
Ærre-Geól Nov. 28 – Dec. 27

Although not all ancient heathen peoples celebrated solstices and equinoxes, many modern heathen sects and groups do. For 2019 these dates will be:

Spring Equinox March 20 Summer Solstice June 21 Fall Equinox Sept. 23 Winter Solstice Dec 21

A few more heathen or heathen related cultural holidays in January 2019 are:

Jan 1:

Yuul ends (Urglaawe)

Julfest ends (Germany)

Jan 8th:

The Whittlesea Straw Bear Festival in Whittlesea, England is celebrated the Tuesday following Plough Monday. Plough Monday is the first Monday after Twelfth Night (by the Gregorian Calendar.) In 2019 the Tuesday after Plough Monday is January 8th.

Midwinterhoorn Blazen ends (Overijssel, Netherlands)

Jan 9:

Day of Raud of Strong (American Asatru, Odinist)

Jan 11:

Þorrablót (Icelandic Asatru)

Jan 21:

Thurseblot (American Asatru)