Perhaps you can give them a personal invitation...
1	Perhaps	perhaps	ADV	RB	_	4	advmod	4:advmod	_
2	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	4	nsubj	4:nsubj	_
3	can	can	AUX	MD	VerbForm=Fin	4	aux	4:aux	_
4	give	give	VERB	VB	VerbForm=Inf	0	root	0:root	_
5	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	4	iobj	4:iobj	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	8:det	_
7	personal	personal	ADJ	JJ	Degree=Pos	8	amod	8:amod	_
8	invitation	invitation	NOUN	NN	Number=Sing	4	obj	4:obj	SpaceAfter=No
9	...	...	PUNCT	,	_	4	punct	4:punct	_
