I'm really disappointed too - one of my favorite shows.
My understanding is that the show hotel is still closed and a reopening date hasn't been confirmed.
Charles Berg gave me permission to share his email from yesterday.
When the COVID-19 pandemic broke earlier this year – and stamp shows began to be cancelled - the Chicago Philatelic Society [CPS] hoped that things would be sufficiently under control by the late dates for CHICAOPEX '20 [November 20-22] that the show could be held. The current circumstances make it clear that the show cannot be held – and CHICAGOPEX '20 is hereby cancelled. The reasons are quite evident:
 It is hard to imagine a "more elderly" [hence more at-risk of COVID-19 infection] gathering of people than a group of stamp collectors and stamp dealers [too many of whom have underlying medical conditions].
 No vaccine against the coronavirus will be available in the "near future" [which at best will be next year] – nor will any significant degree of "herd immunity" be established. Treatments continue to evolve – but there are no sure-fire treatments for the infection yet.
 At this moment, the US [in particular] is seeing a significant reversal of what looked like a successful attempt to control the spread of the virus – in about 40 states! Hospitals and emergency rooms are nearly over capacity in some of the hardest-hit cities.
 This reversal is so significant, that last week the mayor of Chicago imposed a 14-day quarantine on persons arriving by air from the 15 most-affected states.
 While Illinois has been slowly reopening, severe limitations on the allowed size of gatherings will doubtless still be in place in November. In the current Stage 4, indoor gatherings are permitted to the "lesser of up to 50 people OR 50% of overall room capacity." Legislation has been proposed to increase these limits – but its passage is unsure.
 Anecdotally, 20 members of one local club were recently polled as to whether they would attend a show at this moment: 2 said "maybe" and 18 said "no way."
 A significant number of CPS and CHICAGOPEX committee members have already said they would not attend a show this year [or cannot, given their economic problems caused by the pandemic].
Of the 9 judges for the philatelic exhibits, one has already withdrawn – and three have now expressed "strong reservations" since they are in the high-risk age group. The exhibits themselves are lagging badly.
 The St. Louis Expos is still [re]scheduled for mid-August. Its results [dealer and collector attendance] will be interesting to see – but may be too late to factor into our decision about CHICAGOPEX.
 Some of you dealers have expressed a strong hope that CHICAGOPEX could be held [by this time, we all need some sales!] However, one local dealer has already told me he would not participate this year; another local dealer said he would not participate in any show that required him to travel by air.
 Finally, as one of our dealers discovered yesterday, the Westin has all of its eating establishments closed at this time and is NOT booking anything but very small meetings – and they are not sure when that will change.
There have been suggestions as to how a show could be held at this time, e.g., requiring masks for all, providing lots of hand sanitizers, installing plexiglass barriers between all booths, requiring all who come to sign a waiver not to sue us if they come down with the virus after attending the show, taking temperatures of arriving dealers and collectors, etc. However, there would be major issues for the bourse space [the exhibit area, not so much: "social distancing" has long been in evidence in those areas!]. Moving half of the dealers out of the main room has been suggested – but to where [and who will accept being put into a "side" room?]? It has been suggested that people be stationed by the doors to count and control the number of people allowed in the room at one time; Walmart has been doing this – creating long lines outside awaiting admission [which could be a real problem – given the notorious impatience of stamp people]. But if we are held to a max of 50 people in the room – not the 50% of last year, as some have suggested – that would mean 25 one-man dealers and 25 customers at a time!
The bottom line is that it is impossible to hold any show until a vaccine is in full use. With the current level of health concerns, there is no way to know what attendance we would have – or what sales dealers would have. And with any significant reduction in the number of participating dealers, CPS would not have enough income to stage the event – and participating dealers would not have enough sales to justify their participation.
For those of you have had made a deposit for the 2020 show, we will of course refund your deposit – or put it towards your having a booth at CHICAGOPEX in 2021. Please let me know your preference.