So the last weekend in January would work well (and I will need a rest from formal affairs!).
1	So	so	ADV	RB	_	8	advmod	8:advmod	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	4:det	_
3	last	last	ADJ	JJ	Degree=Pos	4	amod	4:amod	_
4	weekend	weekend	NOUN	NN	Number=Sing	8	nsubj	8:nsubj	_
5	in	in	ADP	IN	_	6	case	6:case	_
6	January	January	PROPN	NNP	Number=Sing	4	nmod	4:nmod:in	_
7	would	would	AUX	MD	VerbForm=Fin	8	aux	8:aux	_
8	work	work	VERB	VB	VerbForm=Inf	0	root	0:root	_
9	well	well	ADV	RB	Degree=Pos	8	advmod	8:advmod	_
10	(	(	PUNCT	-LRB-	_	14	punct	14:punct	SpaceAfter=No
11	and	and	CCONJ	CC	_	14	cc	14:cc	_
12	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	14	nsubj	14:nsubj	_
13	will	will	AUX	MD	VerbForm=Fin	14	aux	14:aux	_
14	need	need	VERB	VB	VerbForm=Inf	8	conj	8:conj:and	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	16	det	16:det	_
16	rest	rest	NOUN	NN	Number=Sing	14	obj	14:obj	_
17	from	from	ADP	IN	_	19	case	19:case	_
18	formal	formal	ADJ	JJ	Degree=Pos	19	amod	19:amod	_
19	affairs	affair	NOUN	NNS	Number=Plur	16	nmod	16:nmod:from	SpaceAfter=No
20	!	!	PUNCT	.	_	14	punct	14:punct	SpaceAfter=No
21	)	)	PUNCT	-RRB-	_	14	punct	14:punct	SpaceAfter=No
22	.	.	PUNCT	.	_	8	punct	8:punct	_
