The holy days and fests outlined in Leviticus 23 are The Sabbath, the Passover (including the Feast of Unleavened Bread), the Feast of Firstfruits, the Feast of Weeks, the Feast of Trumpets, the Day of Atonement, the Feast of Booths. In the discussion, we will talk about the meaning of convocation.

Leviticus 23

The LORD spoke to Moses, saying:

2 “Speak to the children of Israel, and say to them ‘These are the feasts of the LORD, which you shall proclaim to be holy convocations. 

3 Six days shall work be done: but the seventh day is the Sabbath of rest, a holy convocation; you shall do no work in it: it is the Sabbath of the LORD in all your dwellings.

4 These are the feasts of the LORD, holy convocations, which you shall proclaim in their seasons.

5 On the fourteenth day of the first month at evening is the LORD’s Passover.

6 And on the fifteenth day of the same month is the feast of unleavened bread to the LORD: seven days you must eat unleavened bread.

7 On the first day you shall have a holy convocation: you shall do any ordinary work. 

8 But you shall offer to the LORD an offering made by fire seven days: on the seventh day is a holy convocation: you shall do no ordinary work.'”

9 The LORD spoke to Moses, saying:

10 “Speak to the children of Israel, and say to them ‘When you come into the land which I give to you, and shall reap the harvest, then you shall bring the first sheaf of your harvest to the priest:

11 He shall wave the sheaf before the LORD, to be accepted for you: the priest shall wave it on the day after the Sabbath. 

12 And you shall offer that day when you wave the sheaf a male lamb without blemish of the first year for a burnt offering to the LORD.

13 The grain offering shall be two tenths of an ephah of fine flour mingled with oil, an offering made by fire to the LORD for a pleasing aroma: and the drink offering shall be wine, the fourth part of a hin.

14 You shall eat neither bread, nor parched corn, nor green ears, until the day that you have brought an offering to your God: it shall be a statute forever throughout your generations in all your dwellings.

15 And you shall count seven full weeks beginning on the day after the Sabbath that you brought the first sheaf to the priest:

16 The day after the seventh sabbath shall be fifty days; and you shall offer a new grain offering to the LORD.

17 You shall bring out of your homes two loaves of bread to be waved, each made of two tenths of an ephah of fine flour, baked with leaven. They are the firstfruits to the LORD.

18 You shall offer with the bread seven lambs without blemish of the first year, and one young bull, and two rams. They shall be for a burnt offering to the LORD, with their grain offering and drink offerings, an offering made by fire, a pleasing aroma to the LORD.

19 Then you shall sacrifice one kid of the goats for a sin offering, and two lambs of the first year for a peace offering.

20 The priest shall wave them with the bread of the firstfruits for a wave offering before the LORD, with the two lambs: they shall be holy to the LORD for the priest.

21 And you shall proclaim a holy convocation on the same day. You shall do no ordinary work; it shall be a statute forever in all your dwellings throughout your generations.

22 When you reap the harvest of your land, you shall not pick clean the corners of your field, neither shall you gather any gleaning of your harvest: you shall leave them for the poor, and for the stranger. I am the LORD your God.'”

23 The LORD spoke to Moses, saying:

24 “Speak to the children of Israel, saying ‘On the first day of the seventh month, you shall have a Sabbath, a memorial proclaimed by blowing trumpets, a holy convocation.

25 You shall do no ordinary work, but you shall offer by fire an offering to the LORD.'”

26 The LORD spoke to Moses, saying:

27 “Also on the tenth day of this seventh month there shall be a day of atonement: it shall be a holy convocation for you. You shall fast and make a food offering to the LORD. .

28 You shall do no work on that day: for it is a day of atonement, to make an atonement for you before the LORD your God.

29 For anyone that is not fasting on that day, he shall be cut off from among his people.

30 And anyone that does any work on that day, I will destroy that person from among his people.

31 You shall do no kind of work: it shall be a statute forever throughout your generations in all your dwellings.

32 It shall be to you a Sabbath of rest, and you shall deny yourselves: on the ninth day of the month at evening, from evening to evening, shall you celebrate your Sabbath.”

33 The LORD spoke to Moses, saying:

34 “Speak to the children of Israel and say ‘The fifteenth day of this seventh month shall be the feast of tabernacles for seven days to the LORD.

35 On the first day shall be a holy convocation: you shall do no ordinary work.

36 Seven days you shall offer to the LORD an offering made by fire. On the eighth day shall be a holy convocation to you; and you shall offer to the LORD an offering made by fire. It is a solemn assembly; you shall do no ordinary work.

37 These are the feasts of the LORD, which you shall proclaim to be holy convocations, to offer an offering made by fire to the LORD, a burnt offering, and a grain offering, a sacrifice, and drink offerings, everything on his day.

38 Beside the Sabbaths of the LORD, and beside your gifts, and beside all your vows, and beside all your freewill offerings, which you give to the LORD;

39 On the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep a feast to the LORD seven days: on the first day shall be a Sabbath, and on the eighth day shall be a Sabbath.

40 On the first day you shall take the boughs of goodly trees, branches of palm trees, and the boughs of thick trees, and willows of the brook; and you shall rejoice before the LORD your God seven days.

41 And you shall keep it a feast to the LORD seven days in the year. It shall be a statute forever in your generations: you shall celebrate it in the seventh month.

42 You shall dwell in booths seven days; all native born Israelites shall dwell in booths:

43 That your generations may know that I made the children of Israel to dwell in booths, when I brought them out of the land of Egypt: I am the LORD your God.'”

44 And Moses declared to the children of Israel the feasts of the LORD.

See also: Leviticus 23 in ESV, HCSB, NASB and NIV via Bible Gateway.